I love T-mobile whenever I am in the US. Coupled with Google Voice and Nexus 4 (LTE works!), I pay way less than an AT&T contract + phone. The only time I was u

I love T-mobile whenever I am in the US. Coupled with Google Voice and Nexus 4 (LTE works!), I pay way less than an AT&T contract + phone. The only time I was unhappy with their coverage was in my apartment in Mountain View this fall. Apart from that, I've never had to call their customer service. Every time I come back to US, I simply recharge my account online and get going in minutes. I am curious to try out the Walmart plan (refer comments) next time and cut my costs by half.