I just don't see the value in T-Mobile for my wife and me. We currently have AT&T with a 24% FAN discount on a 6 GB MSV plan with rollover data. Our service is roughly $90/month for two off-contract iPhones including the taxes and fees.
Looking at T-Mobile's site, the cheapest postpaid offering they have for two off-contract BYOPs is $80/month plus taxes/fees for 2 GB for each line but the 2 GB per line plan does not include Data Stash. To get Data Stash on both lines, you have to bump up to the 6 GB per line plan but that cost is $110/month plus taxes and fees...so roughly $25 more than we're currently paying with AT&T and it gives us more data than we need -- we're fine sharing 6 GB now and having some rollover each month.
We also have roaming in Canada and Mexico included on our AT&T plan -- unlimited voice, text, but only 1 GB of data per line. We do not have unlimited calling from the U.S. to Canada and Mexico but we don't need that.
Maybe I'm missing something, but I just don't see the savings with T-Mo's postpaid offerings compared to our AT&T FAN discount.
So, if you bumped each line to 10 gigs, your cost would drop to $100/mo rather than the $110/mo you'd get with only 6 gigs per line. And naturally, you'd get the free roaming in Canada and Mexico with full access to your data bucket, and then the unlimited data at slow speeds basically everywhere else in the world.
So the value in T-Mo really starts kicking in at higher allotments. I can do 6 lines at 10 gigs for $180/mo. Whereas I have 30 gig (data doubled from 15) for 100 on AT&T, plus 90 in phone fees... so I do see a value. But I also have 4 open phone payments too... and I want to dump the other 4 people and go on my own with my wife and I anyway since our kids are only getting older and will start asking for their own eventually.