I was an early adopter when T-Mobile rolled out their $50 unlimited everything plan in NYC. The pros outweigh the cons, but they do sometimes give me pause. I don't have service in 90% of my apartment in the middle of Manhattan. It is a newish(2001) building, but my fiancee has full service from Verizon. Outside of NYC the service is fairly spotty compared to bigger networks. T-Mobile with an unlocked 5S is priceless for travel. I just got back from a trip to Japan, and the Philippines. You don't need a SIM card. The phone joins the network it supports, and T-Mobile texts you your limits. 200mb of 3G data, unlimited text messaging, and cheap phone calls were included in my standard unlimited plan with no configuration. I pay $77.76 a month for unlimited everything, and 2GB of tethering data. I suggest it in a bigger city or if you travel internationally and need to stay connected. I give pause to people in the suburbs. I am sure it will get better though.