"I want to save money on my smartphone bill with a cheap SIM." "I'm looking for an affordable iPhone for a second device." As these needs grow, used, SIM-free iPhones are gaining attention. However, many people may feel uneasy, wondering, "Is buying used really okay?" or "Where can I buy one safely?"

This article clearly explains the benefits of used SIM-free iPhones, tips for choosing one, and points to note.

What is a SIM-free iPhone? Differences from carrier-locked versions

Definition of SIM-free and differences from carrier-locked versions

SIM-free refers to an iPhone that is not tied to a specific mobile carrier. In contrast, carrier-locked versions are sold by carriers such as Docomo, au, and SoftBank, and typically have a "SIM lock" that restricts their use to that particular carrier.

However, due to the Ministry of Internal Affairs and Communications' policy, SIM locks can now be removed from carrier-locked versions under certain conditions. Nevertheless, SIM-free devices, which have no lock from the start, offer greater freedom for using low-cost SIMs and for communication while traveling or on business trips abroad, allowing for flexible operation.

Reasons for the popularity of used SIM-free iPhones

Used SIM-free iPhones are attracting attention due to their compatibility with low-cost SIMs. They can significantly reduce monthly communication fees, and since there are no contractual ties, switching plans is easy. They are an ideal choice for people who want to freely choose their communication plan or who want to keep initial costs down.

Benefits of choosing a used SIM-free iPhone

High cost performance

The biggest appeal of a used SIM-free iPhone is its low price. Many models are 30,000 to 50,000 yen or more cheaper than new ones, making it possible to choose a higher-grade model with the same budget. Models from one to two years ago still offer sufficient processing power and camera performance for everyday use.

Furthermore, being SIM-free means there are no restrictions such as installment payments for the device, allowing for a simple choice and purchase of the model. For users who prioritize cost performance, it can be said to be an ideal choice.

High degree of contractual freedom

A SIM-free iPhone allows you to freely choose your mobile carrier and pricing plan according to your preferences. Since there are no contractual ties, it's smooth to use with a low-cost SIM or to switch providers (MNP). For eSIM-compatible models, it's also possible to have two lines by using it in conjunction with a physical SIM.

The ability to significantly reduce monthly communication fees by using a low-cost SIM is also an attractive feature, earning strong support, especially among budget-conscious younger generations.

Ideal for low-cost SIMs and having two devices

There's also a growing demand for "sub-devices" – a second smartphone separate from the main one, for work, travel, or subscription viewing. A used SIM-free iPhone allows you to get a sub-device at an affordable price, making it perfect for needs like wanting separate LINE accounts or a phone specifically for photography.

Checkpoints when purchasing a used iPhone

Does it have "Red ROM" warranty?

"Red ROM" refers to a device that has been restricted from communication by a mobile carrier due to reasons such as delinquent installment payments in the past. Since the internet may suddenly become unusable after purchase, having a "Red ROM warranty" is extremely important.

Is it SIM-unlocked?

When purchasing a used iPhone that was originally sold by a carrier, it is essential to confirm whether the SIM lock has been removed. If the lock remains, it may not be possible to use a low-cost SIM. PRODIG explicitly states on its listings whether devices are SIM-unlocked at the time of sale, offering peace of mind even for first-time used buyers.

Maximum battery capacity

On an iPhone, you can check the maximum capacity by going to [Settings] → [Battery] → [Battery Health]. If it's below 80%, it might not last a full day, so consider a replacement. PRODIG lists the battery condition for each product, so you can check it before purchasing.

Warranty and return policy

A "warranty" is especially important for used items. A warranty of at least 30 to 180 days provides peace of mind in case of initial defects or problems. PRODIG offers a standard 180-day warranty and accepts returns.

View all used SIM-free iPhones

Where is it safe to buy a SIM-free iPhone?

Risks of flea markets and private sales

While prices are low, private sales and flea market apps often lack warranties or operational checks. It's impossible to inspect the actual item, and problems like "Red ROM," battery degradation, or cracked screens are common. Handling issues in such cases is also at your own risk, so it's not highly recommended for beginners.

Difference from Apple Certified Refurbished Products

Apple certified refurbished products are of high quality and offer a certain level of peace of mind. However, their prices can be high, with even older models sometimes costing almost as much as new. Used SIM-free iPhones are more suitable for users who want to keep costs down further.

Buying from a specialty store is safer

When purchasing a used iPhone from a specialty store that handles devices with confirmed operation, Red ROM warranty, and cleaning, you can achieve a good balance of quality and price. Some stores also allow you to inspect the actual device and consult with staff, which increases peace of mind.

View all used SIM-free iPhones

Benefits of choosing a used SIM-free iPhone at PRODIG

• All products come with a permanent Red ROM warranty and a 180-day warranty.

• Operation checked & all models cleaned.

• Battery condition clearly stated on the product page.

• Physical store in Akihabara (in-person support available).

Our expert staff will provide thorough in-store support, even for those buying a used smartphone for the first time.

PRODIG also offers in-store trade-in services, allowing you to dispose of your old device and purchase a new one at the same time.

This prevents situations where you buy a new device but miss the timing to sell your old one, only to find its value has decreased when you finally do.

Frequently Asked Questions (FAQ)

Will a used iPhone break easily?

You can significantly reduce the risk by purchasing one with confirmed operation and a warranty. It's especially safe if the shop offers a 180-day warranty or a Red ROM warranty.

Which low-cost SIMs can be used?

SIM-free iPhones are compatible with major MVNOs such as Rakuten Mobile, UQ mobile, Y!mobile, and IIJmio.

What is the battery life?

Apple officially recommends battery replacement when the maximum capacity drops below 80%. PRODIG clearly states the condition and can discuss replacement options.

In Closing

A used SIM-free iPhone is a highly practical choice for building a communication environment that suits you while keeping costs down. Once your concerns are addressed, you will experience almost no inconvenience in daily use.

At PRODIG, all used iPhones come standard with a permanent Red ROM warranty and a 180-day warranty, offering a product lineup you can choose from with confidence. Why not take this opportunity to start a smart smartphone life with a used SIM-free iPhone?

Used iPhone List (PRODIG)

PRODIG's Trade-in Service