What's new in iOS 26.4? New features, bug fixes, and important notes explained

iOS 26.4 is an update that improves daily usability rather than being a flashy major overhaul. It includes added features around Apple Music, 8 new emoji, improved keyboard input accuracy, enhanced accessibility, various bug fixes, and security updates. Apple released iOS 26.4 and iPadOS 26.4 on March 24, 2026, and has also provided information on compatible devices and security content.

This update is valuable not only for those who want to try out the latest features, but also for those who "want to use their current iPhone comfortably for as long as possible," "want to keep replacement costs down," or "want to know how to choose wisely when considering used iPhones and iPads."

In particular, ease of input, music functions, readability, and security for safe use are points that directly impact daily satisfaction. This article summarizes the changes in iOS 26.4, bug fixes, precautions before updating, and considerations for replacing older devices.

▶What is the latest iOS 26.4.1? An easy-to-understand explanation of the minor update focused on bug fixes

What is iOS 26.4? Key Update Points to Know

iOS 26.4 is one of the latest updates in the "iOS 26" series for iPhones, and it includes new features for Apple Music, accessibility improvements, new emoji, enhanced Reminders functionality, improved payment methods for Family Sharing, better keyboard accuracy, and security fixes.

It was released on March 24, 2026, and Apple's security information indicates that the fixes target iPhone 11 and later. This means that if you're using a relatively new iPhone, this update is likely to bring practical improvements rather than just minor fixes.

What's important in update-related articles is not just "what has changed," but "whether the changes are relevant to you." iOS 26.4 is a particularly meaningful update for those who listen to a lot of music, type a lot on social media and messages, prioritize screen visibility, or are concerned about security. On the other hand, if your iPhone is getting old, an OS update alone may not dramatically improve comfort. In that case, the update can be an opportunity to consider "whether to continue using the current device" or "move to a newer used model."

First, here's a brief summary of the key points:

It's easier to make a judgment if you think of OS updates not as a "festival of new features," but as "maintenance to keep your device usable and secure." Especially for those considering used devices, the newness of the compatible OS is a significant factor in determining whether it can be used safely for a long time.

What's New in iOS 26.4? Summary of Main Features

The first new feature to note in iOS 26.4 is the expansion of Apple Music. According to Apple's official guide, it includes "Playlist Playground (beta)" for generating playlists from descriptions, "Concerts" to make it easier to find nearby live performances, "Offline Music Recognition" to save song identifications offline and return results after connecting, and an Ambient Music widget that can be added to the home screen.

Additionally, full-screen background display for albums and playlists has been enhanced. For those who frequently play music or switch between playlists during commutes or work, this update significantly improves usability.

In addition, 8 new emoji have been added. While emoji may seem like a small change, it's a subtle but impactful point for those who use them daily in messages, social media, and chats. Furthermore, Freeform gains image creation and editing tools and a premium content library, and Reminders makes it easier to mark important events as urgent.

With Family Sharing, adult members can now make purchases using their own payment methods, making family payment management easier.

Apple Music enhancements are easily noticeable

This iOS 26.4 update offers particular benefits to frequent music users. Playlist Playground, which builds playlists from AI-generated descriptions, is convenient for finding music to match your mood or purpose.

It allows you to generate song selections from vague requests like "I want to concentrate," "I want to relax," or "for a night drive," making it easy to use even if you're not a music expert. Furthermore, the Concerts feature makes it easier to discover nearby live performance information from artists in your library or recommendations.

Additionally, offline music recognition makes it easier to identify songs later when you're out and about or in an area with poor reception.

This is surprisingly convenient for those who want to look back on background music they heard, songs in stores, or music playing in the city. While not a major feature addition, it's certainly valuable as an improvement aimed at "increasing the satisfaction of your everyday iPhone."

Improvements to input and daily operations are also significant

Apple also explicitly states that iOS 26.4 improves the accuracy of quick keyboard input. The difficulty of text input affects all operations such as email, chat, social media, and search, so it is actually quite important. Especially for those who frequently use flick input or fast typing, reducing typos and missed characters can significantly reduce stress.

For daily usability, the urgent setting for Reminders and filtering with Smart Lists are also convenient. For those who manage both work and personal tasks on one device, or use Reminders as a memo pad, these are simple but effective improvements. OS updates tend to be evaluated solely on flashy new features, but whether these "daily interaction" parts are refined is often more directly linked to actual satisfaction.

Bug Fixes and Security Implications in iOS 26.4

iOS 26.4 is a significant update not only for its new features but also for its bug fixes and security enhancements. Apple officially notes improved keyboard input accuracy, and security documentation indicates vulnerability remediation in multiple areas, including 802.1X, Accounts, App Protection, and Audio. This covers critical areas related to daily use, such as authentication, access to sensitive user data, app protection under Stolen Device Protection, and crashes when processing malicious content.

The important thing here is that "fewer visible new features" does not necessarily mean "no need to update." The value of an OS update lies not only in convenience but also in maintaining a state where you can continue to use your device with peace of mind. Especially for those who use online banking, payments, business apps, social media, and consolidate family photos or work data on one device, security updates are of great importance. Even for those considering a used iPhone, the newness of the supported OS is a big factor in deciding whether it can be used safely for a long time.

Security updates are more important than "comfort"

Apple's security information explicitly states that iOS 26.4 / iPadOS 26.4, released on March 24, 2026, includes multiple fixes. Compatible devices are iPhone 11 and later, and for iPads, relatively newer generations of Pro, Air, iPad, and mini models.

Specifically, it addresses risks such as network communication interception, potential access to sensitive data by apps, behavior under Stolen Device Protection, and crashes when processing maliciously crafted content.

While the technical terms may seem difficult, from a user's perspective, it's enough to understand that "updating increases peace of mind compared to continuing to use it as is." Precisely because it's a smartphone we use every day, unseen fixes shouldn't be underestimated.

Improved keyboard accuracy is subtle but highly satisfying

Apple has announced that iOS 26.4 improves the accuracy of fast keyboard input. While this may vary from person to person, it significantly impacts functions at the heart of smartphone operation, such as messaging, searching, note-taking, and social media posting.

In particular, those who have felt "it's been a bit difficult to type recently" or "conversions feel off" may find their experience changed by this update. The value in updating, even without major new features, lies in reducing these small daily stresses. For those who want to continue using their current iPhone, this is truly a well-suited update.

Benefits of updating to iOS 26.4 and when it's okay to wait

The benefits of updating to iOS 26.4 can be broadly categorized into three areas: "convenience," "peace of mind," and "extended lifespan." In terms of convenience, there are improvements to Apple Music, Reminders, caption settings, and screen display, while security updates contribute to peace of mind.

Extended lifespan means that some of the frustrations with your current iPhone are reduced, making it easier to decide "maybe I don't need to replace it yet." For those who prioritize cost-effectiveness and want to continue using their current device as long as possible, this update is a good fit.

On the other hand, not everyone needs to update immediately upon release. Those who use specific business apps, want to carefully assess compatibility with apps and peripherals, or are concerned about temporary battery behavior changes may find it reasonable to wait a few days to a week. However, given that security fixes are included, deferring updates for a long time is generally not recommended.

Here's how to make a decision:

The trick to deciding whether to update is to consider "whether it benefits your usage" rather than simply "being the latest." If you already feel your device is slow, has poor battery life, or insufficient storage, then an OS update might not be enough to fundamentally solve the problem, and you might consider replacing the device itself.

PRODIG's list of used iPhones can be found here
https://prodig.co.jp/collections/iphone

PRODIG's list of used iPhone 14 series can be found here
https://prodig.co.jp/collections/iphone-14series

PRODIG's list of used iPhone 15 series can be found here
https://prodig.co.jp/collections/iphone-15series

Precautions Before Updating and How to Prepare Successfully

What to keep in mind before installing iOS 26.4 is not the update itself, but "preparation before updating." Apple also states that software updates may affect performance and battery, and immediately after an update, temporary heating and increased power consumption may occur due to index rebuilding and internal processes. This is not necessarily a bug and may subside within a few days.

Also, during an update, ensuring sufficient free space, a stable Wi-Fi environment, adequate charging, and a backup are fundamental. This preparation remains the same whether it's a used device or a new one. Especially for those with many photos and videos, or those who use work-related or authentication apps, it's reassuring to check these points before updating, just in case. OS updates are meant to bring convenience, but insufficient preparation can sometimes lead to more trouble.

Checklist before updating

The minimum items to check before updating are as follows:

• Is the battery sufficiently charged, or can it be updated while charging?
• Is the Wi-Fi environment stable?
• Are photos, contacts, notes, etc., backed up?
• Is there enough free storage space?
• Do you know the login information for apps used for work or authentication?

These are basic, but many people regret skipping them. Especially for those who use only one device rather than two, update failures or temporary instability can directly impact daily life, so it's safer to proceed carefully.

For older devices, calmly assess "comfort after updating"

While iOS 26.4 is a convenient update, if your device is old, you might encounter a situation where "the OS is new, but the device's performance has its limits." It's not uncommon for OS updates alone not to fundamentally resolve strong dissatisfactions like slow app switching, poor battery life, or insufficient storage.

In such cases, instead of forcing yourself to buy the latest flagship model, switching to a relatively newer used model like an iPhone 13 or iPhone 14 series might result in a better balance of satisfaction and cost.

PRODIG offers a list of iPhones and series-specific pages, which is advantageous for comparing based on your budget. The collection pages for the iPhone 13 and iPhone 14 series make it easy to compare products by rank and price range, facilitating cost-effective choices.

For those interested in iPadOS 26.4: Value to consider alongside iPhone

Alongside iOS 26.4, Apple also released iPadOS 26.4 on March 24, 2026. The security information includes compatible devices such as iPad Pro 12.9-inch (3rd generation and later), iPad Pro 11-inch (1st generation and later), iPad Air (3rd generation and later), iPad (8th generation and later), and iPad mini (5th generation and later).

For those who use an iPad in addition to an iPhone, it's important to consider this update not just as a "smartphone-only issue," but in terms of the overall usability of all your Apple products.

Especially for those considering dual-device or sub-device usage, leveraging a used iPad is a realistic option. By using your smartphone primarily for communication and portability, and your iPad for videos, reading, notes, and work assistance, you can achieve greater overall satisfaction without having to force yourself to buy an overly expensive smartphone.

For those who prioritize cost-effectiveness, it can sometimes be more rational to "choose the optimal used device for each purpose" rather than "buying an all-in-one smartphone at a high price."

iPad Air and iPad series offer a good balance of cost-effectiveness

PRODIG's iPad Air page allows you to compare models from iPad Air 2 to iPad Air 5, as well as differences in Wi-Fi / Cellular, and S, A, B, C ranks.

For those who want to strike a balance between price and performance, the iPad Air is a very strong contender. Additionally, there's a list page for the iPad series, making it easy to compare the cost-effectiveness of the regular iPad models.

If your main uses are watching videos, online meetings, viewing documents, and note-taking, you don't necessarily need the top-tier model. The idea of using an iPad as a secondary device while keeping your iPhone running smoothly is also a good fit for cost-conscious individuals in their 20s and early 30s.

PRODIG's used iPad series list can be found here
https://prodig.co.jp/collections/ipadseries

PRODIG's used iPad Air series list can be found here
https://prodig.co.jp/collections/ipad-air

PRODIG's used iPad Pro series list can be found here
https://prodig.co.jp/collections/ipad-proseries

Where to look for peace of mind when choosing a used iPhone or iPad

When looking at update information like iOS 26.4, many people are torn between "continuing to use their current device or replacing it." While focusing only on new devices can make the price seem high, expanding your view to include relatively newer generations of used devices significantly increases your options.

However, with used items, cheap isn't always good; it's important to carefully consider the condition rank, warranty, return policy, and series selection.

PRODIG's condition ranks are organized as follows: S rank for new, unopened items; A rank for items in very good condition; B rank for items with general signs of use; and C rank for items with noticeable scratches or paint peeling but no impact on functionality.

For those who are hesitant about used items, it's easier to choose if you first decide whether you prioritize appearance or price, based on these ranking criteria. If appearance is a priority, choose A rank; if cost-effectiveness is a priority, B or C rank can be realistic options.

Here are some guidelines for choosing:

Furthermore, if you're "undecided about letting go of a device that's still perfectly usable," selling it can also be an option.

Frequently Asked Questions

Should I update to iOS 26.4?

Generally, if you are using a compatible device, it's a good update to consider. This is because it includes not only new features but also keyboard accuracy improvements and security fixes. Especially for individual users focused on daily use, there are benefits in terms of both practicality and security.

However, if you use business applications or specialized peripherals, it's not too late to check compatibility information beforehand. The important thing is not to postpone it for too long.

Will iOS 26.4 worsen battery life?

Apple states that software updates may temporarily affect performance and battery life. Immediately after an update, you might notice faster battery drain due to internal processes, but this doesn't necessarily mean there's a bug.

If abnormal battery drain persists after several days of use, it's advisable to review your settings and check the device's battery degradation status. In older models, battery wear itself can have a greater impact than the OS.

Finally

iOS 26.4 is a practical update that includes enhancements to Apple Music, eight new emoji, accessibility improvements, improved keyboard typing accuracy, Reminders enhancements, Family Sharing improvements, and multiple security fixes. Released on March 24, 2026, it is well worth checking out for anyone who wants to make their current iPhone more comfortable and last longer.

Furthermore, if you are strongly dissatisfied with the weight or battery life of your current device, it may be smarter to look into a used, relatively new iPhone or iPad rather than just enduring with an OS update. PRODIG makes it easy to compare iPhones, iPhone 13 series, iPhone 14 series, iPad series, iPad Air series, sale items, and items with minor imperfections on a single list page, allowing you to choose based on your budget. The iPad Air page allows you to compare multiple generations and ranks, and there are dedicated navigation paths for specific uses, such as sale pages and junk pages.

"Update and continue using" or "switch to a cost-effective used device"? Whichever you choose, having reliable information for comparison is the shortest path to avoiding mistakes. If you're looking for a device that suits your current usage, start by comparing prices and ranks on the list page.