Originally Posted by
kmersh
I have been with at&t since the days of ...
iPhone 6 Plus would just work and whatever programming it had for at&t it would reprogram itself for T-Mobile ... my Nexus 6 ... seems to feel that my Nexus 6 would work well enough, if not perfectly and that anything it might not be able to do, I really wouldn't miss ... Any thoughts, before I make the change?
Well, I put in my 2 cents, assumed that your iPhone 6 is factory unlocked/not in contract before switching/porting out ... T-Mo's Simple Choice (family) plans have no contract (with credit check, of course) and WiFi calling is "native" to Nexus 6 (also Google Fi, but that's another story) and to iPhones 5's and 6's running iOS 8.x
You are essentially BYOD and activating service by putting into 2 T-Mo Sim cards, after backing up your device's data/pictures/etc. - do your factory reset, pop the SIM in & setup/boot up. Any configurations & settings for these 2 devices should take care of itself OTA or get pushed out once you are on T-Mo's home network, and you should be on the air in minutes & get the SMS and welcome messages, etc. (Have your account info, PIN & password, etc. ready for the porting process, our 2 lines was transferred seamlessly ^ )
We have two Nexus 5 on T-Mo running the latest Lollipop 5.1.1 (can't wait to see MM, after our upcoming TPAC trip first) and doing lots of WiFi calling with Google Hangouts, the latest updates (Apps) are great - which isn't the same as T-Mo's WiFi calling, it's extra option - just like our Talkatone line shared on iPhone 5s and iPad, using data and at no extra cost for our plan. I can't think of anything different or more difficult on your N6 vs. our older N5 that would be disabled or not work nicely on T-Mo's network.
My newest addition is an unlocked VZW iPhone 5s, iTune updated to 8.4.0 with WiFi calling enabled along with FaceTime - working like a charm on T-Mo's network. Taking these devices on a TPAC trip next weekend & will see how they work abroad in TPE & ICN.
Just double check your APN settings & configuration afterward, and match those with recommended entries on T-Mo forums & support sites, they should & coverage is very good these days in big cities & along interstates ... the only gap in data service was inside the Grand Canyon NP & lodging, where AT&T and even VZW's coverage was at best, marginal.
As far as T-Mo's coverage & reception, if still unsure - consider doing a prepaid plan for 30 days as a trial, get a new number for now to do the test ride at your frequent locations @ work/home or even on the road, $40 on prepaid for 30 days of unlimited calling & 1GB of 4G LTE data, throttled to slower Edge/2.5G when your data allowance exceeded.