it works just fine, thank you for asking. I've tried it a couple times and i was able to make cellular calls on my iPad when my iPhone was turned off. a macbook would require el capitan
here is the support article
https://support.apple.com/en-us/HT203032
i was having difficulty with this. i called t-mobile and they weren't much help.
they put me in touch with Christopher from applecare. he lied to me and he had no idea what he was talking about
and he was saying that the iPhone and iPad had to be on the same wifi network
the support article recommends waiting 2 minutes between each step
if you have issues, try powering down and reseeding the sim card
turn off iPhone
eject sim
turn on iPhone
wait until iPhone boots up, unlock iPhone and the home screen loads and it says no sim
insert sim
and then
turn on wifi calling
turn on calls to other devices
(with other phone carriers like AT&T or iOS 8 these two options cannot be turned on simultaneously )
wifi calling will ask you to update e911 address and it might say upgrade to wifi calling on the iPhone
once you go to your other device, like your iPad and go to facetime and do the same thing
like enabling calls from your iPhone, it will set up a pairing code.
once the pairing code is entered you should be getting a message eventually saying that this feature is activated
you cant make any calls until your iPad says that feature is now on
so far as i can figure out, if you turn off your iPhone and it had wifi calling turned on, or you connected your
ipad to a different wifi network, you need to wait 2 minutes before a phone call will be allowed or it won't go through.
one issue i had was with my cellular iPad. i am not sure if the phone # on that sim card would effect wifi calling in anyway so I when i test this i turn off the cellular data.
if you cannot turn wifi calling on at all, it might be because you are on a t-mobile prepaid account. i saw a graph on t-mobile where you compare plans and it said that the per minute plan doesn't come with wifi calling
in order for calls to other devices to work , your iPhone must say "T-Mobile WFI" in the upper left hand corner. if it is just connected to the LTE network, i don't think you can make and receive calls on other devices, but its only 3 days and i haven't fully messed around with it
i have a walmart $30 plan and it works, the walmart plan works with music freedom too
i was getting an error for a while telling me to call t-mobile and ask them to add wifi calling to my account. when i called them , they were stumped. thats when i tried reseeding and it seemed to fix it
