Don't waste your time with t mobile. Discount offered was no where near close to what they advertise. Internationally it's nice for all the data and text your heart desires but domestically it sucks if you live anywhere outside of a major city.
And that unlimited data....yeah doesn't apply everywhere. You get 50 KB, read that again...KB of data. I did one drive outside of town using Gps and my "roaming" data was gone in about 20 minutes. And it's not like I'm in the boonies either.
I've had Verizon Other than that short few month stint at t mobile, Verizon works amazing. Using Skype for calling internationally. Using the company iPad for Internet if needed but most places have wifi.