Let's get the BlackBerry Z30 on AT&T

I have a blackberry z10 unlocked my contract is with att I have a galaxy s3 , s4 and other android phones that I don't want to use & my contract is very close to renew, definitely I don't want and iPhone, then I see it this way, the reason to sign a contract is because we get the cell phone cheaper than without the contract, but the interesting part is att doesn't support blackberry and they don't want to bring updates for blackberry I have been with att for several years but now I am thinking it is time to get other carrier anyway I am buying the blackberry cell phones at full price unlocked I have been checking with prepaid carriers and I found this one, telcel america: internet unlimited, unlimited minutes in usa to cell phones, unlimited mexico to home phones, 1000 minutes internationally to Mexico to cell phones you can google it if you are interested, I like my plan with att but they don't want to accept that not everyone likes iPhone and android