Oh man, now I really gotta make some tough decisions about whether I should switch to T-Mobile.
I'm paying $120~ per month for 2 iPhones, one unlimited data and one 2GB plan. Would it be worth switching?
It gets cheaper the more lines you have. In you case, the bill would be $70 for first line (unl calls, unl txt, unl data) + $40 (unl calls, unl txt, 2.5 GB data). It isn't until you add lines 3, 4 & 5 that the savings really add up ($9.99 per line for unl calls, unl txt, 500MB data and an extra 2gb data is $10).
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How long was left I. Your contract as well as how many lines?
I can't see them doing that for many lines or if more than a couple months left of contract
In my case, I had 5 lines I brought over, 3 were under contract on Att for anywhere from 1-1.5 years, and 2 lines from Verizon which weren't under contract. I had $600 in EFT on the 3 contract lines. The tmobile rep I worked with gave me $200 of credit
per line that I brought over, so $1000 in total. I had enough to pay off the AT&T EFTs, and $400 leftover. My bill went from $260/mo, to $126 on tmobile, after my 15% corporate discount was included. Plus the leftover credit.
I was able to bring over three phones from att that we unlocked, and we used the $400 credit towards two iP5 purchases.
So far, very happy! But I agree 100% with deeddawg. Try it out first. Make sure the coverage is there for you. I happen to be in an area that gets good 4G coverage, and now starting to see LTE too in some spots, so it works for me (coming from att where I also had LTE 90% of the time).