Apple let it be known back in August of 2011 that they'd be deprecating developer access to UDID ( Universal Device Identifier), they've now taken the next step and begun actively rejecting App Store apps that use it. The fine developers of Tweetbot have reported that one of their latest updates was rejected from Apple for collecting UDID information without getting user consent first. What does this mean for apps like Tweetbot?
[UDIDs] allowed us to restore push notifications settings after Tweetbot was deleted and re-installed. With this new change in place this is no longer possible, if you delete and re-install Tweetbot you’ll have to setup your push notification settings again.
The UDID is 40 characters that are unique to your iPhone and iPad, used most generally by developers to provision pre-release apps through the App Store. Now developers will need to create their own unique ID within the app and store it in iCloud.
Ultimately, it's good news that Apple is making sure that developers aren't easily getting a hold on potentially sensitive data like UDIDs; iOS users are a little on edge about privacy after that Path incident.
This might also explain the speed with which Apple went from deprecating the UDID collection to outright rejecting apps. Typically something deprecated in one iOS version will be removed in a later version, giving developers time and an expectation for when they need to have an alternative approach in place. This has led some developers, including
Source: Tapbots, Subfurther
We may earn a commission for purchases using our links. Learn more.

Review: EarFun Free Pro noise-canceling wireless earbuds are well-priced
Looking for truly wireless noise-canceling headphones that won't break the bank? Check out EarFun Free Pro wireless earbuds.

Tim Cook called to EU hearing on power of big tech, February 1
Tim Cook has been invited to an EU hearing on the power of U.S. tech giants on February 1, alongside Jeff Bezos, Sundar Pichai, and Mark Zuckerberg.

Google Drive File Stream will get M1 support in April
Google Drive File Stream will reportedly get support for Apple's M1 chip and Apple silicon in April.

Your iPhone 11 Pro will love these screen protectors!
The screen on your new iPhone is very expensive to replace. Because of this, you may want to consider buying an inexpensive screen protector