We’ve covered this issue before, preemptively. But now is the time to act!
Some reports have emerged that Apple is now massively rejecting apps that still use the “[UIDevice uniqueIdentifier]” a.k.a. the UDID (Unique Device IDentifier).
This means that developers have two choices: drop using this entirely, or find a replacement.
Some have gone the MAC address way, which we strongly advocate against because it is an even more sensitive unique identifier typically used to authenticate devices on VPNs and other private WLANs. So it too faces the risk to be deprecated. And rightly so!
So, if you haven’t done so already, go and check the open-source drop-in replacement, an effort we participate in: OpenUDID.org