When I had T-Mobile, I was using their 3G network (though my phone said 4G) and I only got speeds of 0.10 Mbps. At the most I would get 0.15 Mbps. That was with great signal as well. I talked to T-Mobile about it and they didn't help me one bit. So I switched to Boost Mobile (Sprint) and even though it's slow, it's faster than T-Mobile's speeds that I got.