This is decidedly not the heart-fluttering OMaGad-I-must-have-it-now-or-else feature of Android 5.1, but it's worth noting nonetheless. Remember on Android 5.0 when you headed for the About > Status screen of your phone or tablet and were greeted by a long list of information fields that you had to scroll through and try to figure out the logic behind? No? Maybe? Oh... you have already erased all previous recollections of Android 5.0. I see. Here, let me refresh your memory.

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Old About > Status screen

Well, in Android 5.1, this long list has been consolidated into a smaller one with subsections dedicated to the IMEI and the SIM, the latter including all network, signal, and operator information.

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Left: New About > Status screen. Middle and Right: New SIM and IMEI subsections.

As I mentioned, this isn't an earth-shattering change, but it does make the list easier to navigate and the information faster to get to. The problem, however, is that said information isn't copiable anymore. Previously, you could tap a field to copy its details, for example the IMEI, but that isn't possible anymore. Two steps forward, one step back.