I think the big reason for me was cost. I cut my AT&T (3 phones) bill nearly in half (180 to 100) by switching to T-Mobile and buying a couple Nexus 5s. AT&T ha

I think the big reason for me was cost. I cut my AT&T (3 phones) bill nearly in half (180 to 100) by switching to T-Mobile and buying a couple Nexus 5s. AT&T has become more competitive with their prices since then, so the savings is less now, but still there.