Apple Begins Rejecting Apps for Using the Unique Device Identifier (UDID)

ios5 iconTechCrunch reports that Apple has begun rejecting iOS apps for the use of a unique device identifier known as the UDID. The site notes that several developers have reported rejections for the use of the UDID in the past week, and Apple is said to be ramping up the enforcement of this policy over the next few weeks.

As the name suggests, the UDID is a unique identifier for every iOS device. It's tied specifically to the hardware and can't be changed by the user. Apple had previously warned developers with the introduction of iOS 5 that the use of the UDID was deprecated and would be phased out. The sudden rejections, however, have caught some developers off guard:

“Everyone’s scrambling to get something into place,” said Victor Rubba, chief executive of Fluik, a Canadian developer that makes games like Office Jerk and Plumber Crack. “We’re trying to be proactive and we’ve already moved to an alternative scheme.” Rubba said he isn’t sending any updates until he sees how the situation shakes out in the next few days.

The reason for the phasing out of UDIDs from developer use is due to increased pressure on Apple due to the privacy implications. Apple and several App developers have been sued over the use of the UDID to track users across different apps. While the UDID doesn't specifically identify a user, the sharing of UDIDs across ad networks and apps can help piece together a valuable picture of activity and interests of the user of a specific device. Apple seems to be requiring apps to generate their own unique identifiers for each installation to avoid this ability to share such information across apps.

Top Rated Comments

Virtualball Avatar
142 months ago
Why are developers "scrambling" for a solution to this? They've known for how many months exactly that this was coming?

:rolleyes:
Score: 37 Votes (Like | Disagree)
dejo Avatar
142 months ago
"We're trying to be proactive..."

Really? iOS 5 and Apple's warning have been out there for quite a while now. Seems at lot more reactive to me.
Score: 36 Votes (Like | Disagree)
axonic labs Avatar
142 months ago
How is using UDID a good idea for storing high scores, preferences etc? What happens when users upgrade to a new device?

yep, there are non ad uses for it.

The tough part is that if Apple doesn't allow a well defined transition period for it (where devs can still use the udid), users' apps that do use it for something like above (connecting a device to high scores, storage of preferences / data) will have their data lost on the next app update.

arn
Score: 26 Votes (Like | Disagree)
axonic labs Avatar
142 months ago
How are developers "caught by surprise" and are "scrambling" as it is not exactly news. It sounds like apps are being rejected during the app review process so existing apps should be okay. The article makes it a bigger deal than it actually is.
Score: 25 Votes (Like | Disagree)
axonic labs Avatar
142 months ago
It's just not a good idea to use UDID for storing high score and other preference data. The high score and preference really belong to the user and not the device (users can have multiple or change devices) and the app should use a "user id" rather than a "device id".

If the app has proper customer service, they can do a simple score-transfer. The user would have to prove that they upgraded their device by either logging into their old or new device with their username. If the old device broke, it becomes a little harder to prove the identity of players, but IPs can also prove useful.
Score: 20 Votes (Like | Disagree)
Pakaku Avatar
142 months ago
give me a better way that doesn't require registration.

arn
As I understand it, the problem with using the UDID is that it doesn't track your scores across devices. If you upgrade to a new iPhone, say goodbye to your highscores.

A better idea could be to just do it through Game Center, or being able to sync highscores to iCloud. You have to sign up if you want to use it for other things, anyways.
Score: 18 Votes (Like | Disagree)

Popular Stories

iPhone trade in

Apple Adjusts Trade-In Values for iPhones, Macs, and More

Wednesday January 25, 2023 9:40 am PST by
After announcing new Mac and HomePod models last week, Apple adjusted its trade-in values for select devices in the United States. iPhone trade-in values decreased by up to $80, and most Android smartphones also went down. Mac trade-in values remained unchanged or increased by up to $40 depending on the model, while some Apple Watch models increased in value and others decreased. Trade-in...
iPhone 14 Pro Purple Side Perspective Feature Purple

iPhone 15 Pro Expected Later This Year With These 7 Exclusive Features

Tuesday January 24, 2023 4:53 pm PST by
Apple's next-generation iPhone 15 Pro and iPhone 15 Pro Max are expected to be announced in September as usual. Already, rumors suggest the devices will have at least seven exclusive features not available on the standard iPhone 15 and iPhone 15 Plus. An overview of the seven features rumored to be exclusive to iPhone 15 Pro models:A17 chip: iPhone 15 Pro models will be equipped with an A17...
Mac mini M2 2023

New 256GB Mac Mini and 512GB MacBook Pro Have Slower SSD Speeds Than Previous Models

Tuesday January 24, 2023 1:11 pm PST by
While the new Mac mini with the M2 chip has a lower $599 starting price, the base model with 256GB of storage has slower SSD read and write speeds compared to the previous-generation model with the M1 chip and 256GB of storage. A teardown of the new Mac mini shared by YouTube channel Brandon Geekabit reveals that the 256GB model is equipped with only a single 256GB storage chip, while the...
iOS 16

iOS 16.3 for iPhone Launching Next Week With These 4 New Features

Friday January 20, 2023 11:43 am PST by
In a recent press release, Apple confirmed that iOS 16.3 will be released to the public next week. The software update will be available for the iPhone 8 and newer and includes a handful of new features, changes, and bug fixes. Below, we've recapped bigger features in iOS 16.3, including support for physical security keys as a two-factor authentication option for Apple ID accounts, worldwide ...
iPhone 14 Pro Purple Side Perspective Feature Purple

iPhone 15 Expected to Feature Wi-Fi 6E Like Latest Macs and iPad Pro

Wednesday January 25, 2023 5:39 pm PST by
The iPhone 15 will support Wi-Fi 6E, according to a research note shared this week by Barclays analysts Blayne Curtis and Tom O'Malley. The analysts did not specify whether the feature will be available on all models or limited to the Pro models. Apple has added Wi-Fi 6E support to a handful of devices so far, including the latest 11-inch and 12.9-inch iPad Pro, 14-inch and 16-inch MacBook...
maxresdefault

Hands-On With the New M2 Pro Mac Mini

Tuesday January 24, 2023 1:45 pm PST by
The new M2-series MacBook Pro and Mac mini models launched today, marking the debut of the first M2 Pro and M2 Max chips. We have the M2 Pro Mac mini on hand, and thought we'd take a look at the machine and do a series of benchmarks to see how it fits into Apple's lineup. Subscribe to the MacRumors YouTube channel for more videos. Base model Mac mini machines come with either an M2 or M2 Pro...
apple tv 4k red image

Apple Releases tvOS 16.3

Tuesday January 24, 2023 10:10 am PST by
Apple today released tvOS 16.3, the third major point update to the tvOS 16 operating system that originally came out in September. Available for the Apple TV 4K and Apple TV HD, tvOS 16.3 comes six weeks after tvOS 16.2, an update that added Apple Music Sing. The tvOS 16.3 update can be downloaded over the air through the Settings app on the ‌‌‌‌Apple TV‌‌‌‌ by going to System > Software...
maxresdefault

Hands-On With the New M2 Max MacBook Pro

Thursday January 26, 2023 12:14 pm PST by
New 14-inch and 16-inch MacBook Pro models with the latest M2 Pro and M2 Max chips are available in Apple retail stores and are already in the hands of customers, and we picked up one of the new M2 Max machines to answer all of the questions MacRumors readers considering a purchase might have. Subscribe to the MacRumors YouTube channel for more videos. Yesterday, we asked MacRumors fans on...