I went to T-Mobile and went prepaid with an unlocked phone. A couple weeks ago I got my girlfriend a Nexus 5, and got my mom a Moto G yesterday. I started a post-paid family plan with them because T-Mo don't do them on prepaid. For the 3 of us, its $120 per month for unlimited talk and text, 2.5GB of 4G/LTE, and unlimited 3G. None of use that much data, but we can go completely unlimited for 3 of us for $150 per month if need be. After taxes it comes out to ~$45 per month each on our current plan. For unlimited 4G/LTE, it would run ~$55 per month each. Once I add my brother, itll be even less per month for each of us. FWIW, my friend and his wife pay $190 per month for 2 phones on AT&T sharing 6GB of data.