[RMJ Full Member Businesses Supervise] Precautions When Buying a Used Smartphone | What You Should Know to Avoid Regret
"I'm thinking about buying a used smartphone, but I'm worried."
"I don't want to make a mistake with a used smartphone."
The advantage of used smartphones is that they can be purchased at a lower price than new ones. However, you may regret purchasing a used smartphone if it's "in poor condition" or "breaks down quickly."
In this article, RMJ certified businesses will provide an easy-to-understand explanation of what you should know to avoid regretting your used smartphone purchase.
[Conclusion]
If you know the key points to consider before buying a used smartphone, you can prevent post-purchase problems and regrets, and choose the right device for you.
Also, if you're buying a used smartphone, we recommend "PRODIG," an RMJ certified business known for its quality and warranty.
[By reading this article to the end, you will understand]
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Basic knowledge to know before buying a used smartphone
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Examples of common problems that lead to regret when buying used smartphones
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Precautions when buying a used smartphone
If you are considering purchasing a used smartphone, please read to the end.
Basic knowledge to know before buying a used smartphone
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Basic Knowledge |
Details |
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Understand the difference between unused, used, and junk items |
Unused items have not been used even if unboxed; used items have been used but have no operational problems. Junk items have faults or defects. |
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Understand the meaning of condition ranks |
Condition rating standards such as Rank A (almost no scratches), Rank B (minor scratches), Rank C (signs of use and noticeable scratches) |
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Battery maximum capacity is an important indicator |
Maximum capacity and degradation level are performance factors directly linked to the device's usable time. |
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Understand Red ROM (network usage restrictions) and SIM lock |
Red ROM refers to devices with service stopped by a carrier; SIM lock refers to devices restricted to a specific carrier. |
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Thoroughly understand the characteristics of the retailer |
Warranty period, return policy, and presence of operation checks are sales conditions that affect post-purchase peace of mind. |
Used smartphones are appealing for their lower prices than new ones, but if you choose without knowledge, you may regret it. If you buy without knowing the difference between unused, used, and junk items, you might end up losing money.
In fact, many people later realize that condition ratings like Rank A or B, and battery maximum capacity, directly impact usability. You should also understand restrictions like Red ROM and SIM lock beforehand.
Checking the retailer's characteristics and warranty conditions in advance, and making a purchase only when satisfied, is the quickest way to get a satisfactory device while avoiding failures.
The following article explains the pros and cons of buying a used smartphone in detail.
Thorough Explanation of the Pros and Cons of Buying a Used Smartphone!
Understanding the difference between "unused," "used," and "junk" items
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Category |
Description |
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Unused |
A device that has never been used, like new, with no issues with its exterior or functionality. |
|
Used |
A device with a history of use, potentially showing exterior scratches or battery degradation. |
|
Junk |
A device with operational defects or damage, intended for repair or parts. |
The used smartphone market has three categories: "unused," "used," and "junk." Unused items are devices that have never been used and are in like-new condition. Used items have been used, and are ranked by the degree of use and scratches.
Junk items have operational defects or significant damage, making them difficult for normal use. While junk items are inexpensive, they carry higher risks and are not suitable for beginners. Unless you have a special reason or repair knowledge, choose "unused" or "used" items instead of junk.
The following article provides a detailed explanation of junk iPhones.
Understand the meaning of condition ranks
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Rank |
Condition |
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Rank A |
Very clean with almost no scratches or signs of use. |
|
Rank B |
Minor scratches or light signs of use. |
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Rank C |
Noticeable scratches or significant signs of use. |
Used smartphones are often categorized by condition ranks such as A, B, and C by many retailers. Rank A denotes a very clean state with almost no scratches or signs of use, Rank B indicates minor scratches or light signs of use, and Rank C refers to noticeable scratches or significant signs of use.
These ranks often include not only appearance but also functional inspection results, so it's important to verify if the actual condition matches the photos and descriptions. If you plan to use the device for a long time, it's advisable to choose Rank B or higher for a good balance of performance and aesthetics.
Battery percentage is an important indicator
|
Battery Max Capacity |
Condition Guide |
Usability & Precautions |
Purchase Decision |
|
80% or more |
Relatively good condition |
Minimal impact on normal use, stable battery life |
Recommended for purchase. High probability of long-term use. |
|
Less than 80% |
Degraded condition |
Short battery life, concerns when out and about. |
Likely to need battery replacement soon after purchase. Consider additional costs. |
When buying a used smartphone, particular attention should be paid to battery degradation. Batteries are consumables, and their maximum capacity decreases with longer use and more charge cycles.
For iPhones, you can check the maximum capacity in "Settings," but for Android, the method varies by model. Some retailers may specify the battery condition, so always check.
Generally, a maximum capacity of 80% or more is considered relatively good and is a benchmark for unimpeded use. If it falls below 79%, the battery life will be poor, and a replacement may be needed soon after purchase, which can lead to increased costs.
The following article explains the causes and solutions for rapid battery drain in detail.
Understand Red ROM (Network Usage Restrictions) and SIM Lock
|
Term |
Condition |
Impact |
How to Check |
|
Red ROM |
A device whose usage has been restricted by a mobile carrier due to non-payment or fraudulent contract by the previous owner. |
Inability to make calls or use data communication. |
Check network usage restrictions with the IMEI number. |
|
SIM Lock |
A device restricted to using only SIM cards from a specific carrier. |
Inability to use SIM cards from other carriers. |
Confirm if SIM lock is unlocked before purchase. |
When choosing a used smartphone, you need to be aware of "Red ROM" and "SIM lock." Red ROM refers to a device whose network usage has been stopped by a carrier because the previous owner failed to pay communication fees or entered into a fraudulent contract.
In this state, you cannot make calls or use data communication with any SIM card. A SIM lock means the device is dedicated to a specific carrier, and SIM cards from other carriers cannot be used.
While more devices are now unlocked, older models may still have SIM locks. Before purchasing, check for Red ROM using the IMEI number and always confirm whether the SIM lock has been unlocked.
Thoroughly understand the characteristics of the retailer
|
Purchase Method |
Price Characteristics |
Warranty/Compensation |
Purchase Security |
Other Points |
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Flea Market Apps |
Generally cheaper |
Basically no warranty or limited warranty |
Low. Compensation for troubles is often insufficient. |
Risk of trouble in person-to-person transactions |
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Person-to-person transactions |
Cheapest, but quality varies |
Almost none |
Low |
Almost no compensation or return policy. Difficult to judge trustworthiness. |
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Brick-and-mortar used retailers |
Prices vary by store |
Many comprehensive warranty systems |
High. Face-to-face support and operation checks available. |
In-store device confirmation possible. Easy to get support. |
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Online sales sites |
Can be cheaper with campaigns |
Often includes warranty |
High. Real-time stock checks and comparisons available. |
Purchase 24/7, wide product selection. |
Used smartphones can be purchased through flea market apps, private sales, brick-and-mortar used retailers, and online sales sites.While flea market apps and private sales offer lower prices, compensation in case of trouble may be insufficient.
On the other hand, specialized retailers, such as RMJ certified businesses, have strict inspection standards and warranty systems, ensuring quality and peace of mind.
However, warranty details and durations vary by store, so check before purchasing to ensure they meet your needs. Especially for first-time buyers or those looking for long-term use, purchasing from an RMJ certified business is recommended.
Examples of Common Problems That Lead to Regret When Buying a Used Smartphone
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Trouble Example |
Details |
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Severe battery degradation/consumption |
Decrease in maximum battery capacity due to prior use, leading to poor battery life. Common in devices used for long periods. |
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Purchased used smartphone was a Red ROM item |
A device whose network usage has been restricted by a mobile carrier due to the previous owner's non-payment, etc. Resulting in no communication. |
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Operational defects / SIM lock not unlocked |
Inadequate operation checks or failure to unlock the SIM, leading to inability to use SIM card or activation lock. |
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Exterior scratches / signs of use were worse than expected |
Scratches/dirt not visible in photos or descriptions, significant signs of use, leading to a discrepancy from expectations. |
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Dissatisfaction with warranty / return policy |
Expired warranty, no returns, or insufficient support in case of trouble. |
Used smartphones are appealing for their low price.However, if you buy without knowledge, you may regret it.
To avoid post-purchase failure, it is crucial to check the condition and warranty details before buying, and carefully assess any discrepancies between photos/descriptions and the actual product.
The following article provides a detailed explanation of the risks associated with used smartphones.
What are the dangers of used smartphones? Also explains precautions when purchasing.
Severe battery degradation/consumption
One common problem with used smartphones isbattery degradation. As degradation progresses, battery life becomes poor, and in severe cases, it may not last even a day.
Batteries are consumables, and their performance degrades with increased usage time and charging cycles. Used smartphones that have been subjected to demanding use, such as gaming or video streaming, degrade faster and may require replacement soon after purchase.
To prevent battery-related issues, it's safer to check the battery's maximum capacity and charge cycles on the product page before purchasing, aiming for 80% or more, or choose a device with a replaced battery.
The following article explains the lifespan of an iPhone in detail.
How long do used iPhones last? A guide to battery life and how to extend it.
The purchased used smartphone was a Red ROM item
Red ROM refers to a device that has been subjected to communication restrictions by a carrier due to reasons such as unpaid device fees by the previous owner. While Wi-Fi connection is possible, calls and mobile data communication are not.
Red ROM cannot be removed later, so it's important to choose a device with "network usage restriction ○" (no restriction) before purchasing, and use a retailer that offers a permanent Red ROM warranty. This warranty is often not available in private sales, so special caution is needed.
Operational defects / SIM lock not unlocked
Operational defects such as freezing or restarting may be discovered immediately after purchase. Furthermore, troubles often arise where the device is SIM-locked to a specific carrier and cannot be used with other network providers.
To prevent operational defects and SIM lock issues, always check the retailer's product description and warranty details, and choose a device explicitly stated as "SIM lock unlocked." Whether the return/exchange conditions and warranty period are not too short is also an important criterion for judgment.
Exterior scratches / signs of use were worse than expected
|
Check Item |
Points to Confirm |
|
Frame Corners |
Presence of dents or paint marks, presence of dimples. |
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Around Camera Lens |
Scratches on lens, presence of chips or cracks on frame. |
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Screen (LCD/Glass) |
Presence of cracks, deep scratches, touch defects. |
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Back Panel |
Presence of scratches, cracks, paint peeling. |
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Buttons |
Abnormal feel when pressed, presence of wear or looseness. |
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Terminal Area (Charging Port/Earphone Jack) |
Presence of scratches, dirt, contact defects. |
When purchasing online, it's easy to overlook minor scratches and signs of wear in photos.Upon arrival, you might find paint peeling, cracks, or deep scratches, often leading to an impression different from what was imagined.
Since exterior condition ranking criteria vary by retailer, always check multiple images and detailed descriptions. The corners of the frame and around the camera lens are particularly prone to noticeable scratches. If possible, it is more reliable to inspect the actual product in-store before deciding, which can prevent post-purchase regrets.
Dissatisfaction with warranty / return policy
Used smartphones may have a shorter warranty than new ones, or no warranty at all. Without a warranty, you would have to bear the cost of repair or replacement yourself if initial defects or Red ROM are discovered.Before purchasing, check the "warranty period," "warranty scope," and "return conditions," aiming for a warranty of at least 30 days, or preferably 90 days or more.
For used smartphones, the manufacturer's warranty is almost certainly expired, so the retailer's warranty content is crucial. Some stores offer paid warranty extensions, so if you're concerned, purchasing an extended warranty can provide peace of mind.
Precautions when buying a used smartphone
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Precaution |
Details |
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Purchase from a reputable retailer |
Purchase from a trustworthy store with high sales実績 and positive reviews, and a solid system for operation checks and warranties. |
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Consider the condition of the used smartphone (SIM lock, Red ROM, battery, etc.) |
Pre-check the device's operational and usage status, such as whether SIM lock is unlocked, Red ROM status, and battery capacity. |
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Confirm warranty details |
Check the warranty period, scope, and return conditions to see if they can address potential issues after purchase. |
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Be aware of supported bands for Android smartphones |
Pre-confirm if the device supports the frequency bands of your intended carrier. |
To use a used smartphone with peace of mind, pre-purchase verification is essential. First, choose a reputable retailer with a proven track record, positive reviews, thorough operational checks, and a comprehensive warranty system.
Also, check for SIM lock status, Red ROM status, battery capacity, and other communication restrictions and device conditions beforehand.
Understanding the warranty period, scope, and return conditions will ensure you receive appropriate support in case of a malfunction. For Android devices, always verify that the device supports the frequency bands of your intended carrier.
The following article explains in detail how to choose a used iPhone without making mistakes.
A guide to choosing a used iPhone without regrets or mistakes!
Purchase from a reputable retailer
|
Check Item |
Content |
|
Retailer Reliability |
Whether it has a proven track record, such as being an RMJ certified member. |
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Clear Device Condition |
SIM lock unlocked, Red ROM warranty, battery capacity. |
|
Warranty Details |
Warranty period and scope, presence of long-term warranty. |
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Clarity of Quality Standards |
Proprietary rank descriptions, transparency of inspection system. |
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Physical Inspection Possible |
Can it be inspected at a physical store? |
When purchasing a used smartphone, avoid flea market apps and private sales, and be cautious of retailers with bad reviews or a poor reputation.
When purchasing a used smartphone, it is crucial to choose a specialized retailer with trust and a proven track record. Stores that are members of RMJ (Mobile Reuse Japan) certified businesses, in particular, adhere to strict quality standards and fair trading rules, making it easier to find a satisfactory device.
PRODIG, an RMJ certified business, boasts a strong track record and offers a comprehensive warranty system in addition to stringent inspection procedures. It provides a safe environment even for beginners and is ideal for those who wish to minimize troubleshooting risks.
When purchasing a used smartphone, it is recommended to prioritize not only the price but also the warranty and support, and choose a reliable store.
PRODIG, the official online store for used smartphones and tablets, sells a wide variety of used devices, from iPhones to iPads and Androids.
The following article explains recommended retailers in detail.
Where to buy a used iPhone? Recommended retailers and precautions for purchase explained.
Consider the condition of the used smartphone (SIM lock, Red ROM, battery, etc.)
|
Check Item |
Point |
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SIM Lock |
Confirm if the SIM of the desired carrier can be used, and check unlock status. |
|
Red ROM (Network Usage Restriction) |
Check with the IMEI number on the carrier's website and choose one with "〇 (no restriction)." |
|
Battery Condition |
Check maximum capacity and degradation level, and consider replacement costs if necessary. |
|
Exterior Condition |
Check photos and the extent of scratches and dents. Request detailed images if necessary. |
|
Operation Check |
Confirm if calls, communication, camera, buttons, and fingerprint/face authentication are all functioning normally. |
When choosing a used smartphone, it is crucial to verify the internal condition, not just the exterior. Key items to check are "whether the SIM lock is unlocked," "Red ROM status," and "battery's maximum capacity and replacement history."
Red ROM, in particular, poses a significant risk of losing communication capability after purchase, rendering the device unusable without a warranty. As a standard for used smartphones, aim for models with a battery maximum capacity of 80% or more and minimal degradation, and gather detailed condition information before making a decision.
The article below provides a detailed explanation of the remaining battery life of used smartphones.
Check the warranty details
Used smartphones carry a higher risk of malfunction, so it's crucial to check the warranty details before purchasing. If the warranty period is short or its coverage is limited, you may not be able to receive support in case of a problem.
It is reassuring to choose a retailer that offers a broad scope and longer duration of warranty, such as a permanent "red-ROM" warranty, initial defect exchange, or repair warranty for operational malfunctions. Warranty terms can sometimes include exceptions, such as "exterior scratches and battery degradation are not covered."
Additionally, if you purchase without checking the terms and conditions, the warranty may not be applicable. Even with retailers offering comprehensive warranties, the terms might not suit your specific needs, so it's advisable to check the warranty details beforehand.
To ensure long-term, worry-free use, make sure to check not only the presence of a warranty but also its content and conditions, and choose a retailer you can trust.
Be aware of supported bands for Android smartphones
|
Points to note |
Description |
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Differences in supported bands |
Android smartphones have different supported frequency bands depending on the model. Overseas models and older devices may not support the main carrier bands in Japan. |
|
Impact on communication |
If the supported bands do not match, there is a risk of communication speed reduction or loss of signal. |
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Importance of prior checking |
It is necessary to check the device's supported bands on the retailer's website or the manufacturer's official website before purchasing. |
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Confirming carrier compatibility |
Always confirm that the supported bands of the device match those of the communication carrier you plan to use. |
To use a used Android smartphone comfortably, you need to check its supported bands. The frequency bands that can be used differ depending on the model, and especially with overseas models and older devices, there are cases where they do not support the bands of major Japanese carriers.
If not supported, communication speeds may decrease or you may lose signal. To prevent this, before purchasing, check the supported bands on the retailer's product page or the manufacturer's official website, and be sure to confirm that they match the frequency bands of the carrier you plan to use.
PRODIG, an RMJ regular member business, is recommended for purchasing used smartphones!
The warranty period is a long 180 days, and comprehensive after-sales service is also available, ensuring peace of mind. The condition rank and maximum battery capacity are clearly displayed, allowing you to check all necessary information before purchasing.
Since support is available both at the physical store in Akihabara and through online sales, even those purchasing a used smartphone for the first time can feel at ease. If you prioritize a balance between quality and price, purchasing from reliable PRODIG is recommended.
Furthermore, if you have any concerns or questions regarding the purchase of a used smartphone, please feel free to contact us by phone.
【PRODIG Contact Window】
Phone number: 03-6435-5045
Available hours: 11:00〜18:00
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