I got the Cyan update, and decided to enroll in Preview for Developers right after that, for any new updates, and it had all the good features like being able to select multiple text messages or calls to delete in a batch.
However, it was killing my battery.
I stopped doing Preview for Developers and factory reset the phone and re-updated up to Cyan, and I can't select multiple texts or calls for deletion anymore.
Is this just how 8.1/Cyan is for the T-mobile 925?
I have the Preview on my 521, and it still has though features.
If you know how to select multiple texts for deletion, please let me know how!