Hi everyone...excuse my newbiness. Been on AT&T for decades because of work. New job, can finally switch. But here's my problem--I need wifi calling because of crappy signal in our neighborhood. My unlocked iPhone 6 will be fine since AT&T already had wifi calling enabled. Only 6/6S or newer get wifi calling on AT&T. But the other two phones on my account, a 5C and a 5S, while eligible on T-Mobile for wifi calling, have it disabled on the AT&T branded phones. If I want to make that feature available on these phones, do I have to jailbreak it? Does it involve changing the firmware? Is it even possible to remove the embedded restrictions AT&T put on them? Any help is greatly appreciated!