Different cell providers use different bands. Sprint is now Tmobile and use one band and verison and Att use a different band. Sometimes they have different cell towers and sometimes they share. Sharing the towers seems to be increasing so eventually all of the providers will have a similar signal.T mobile told us we where in a dead zone only had 4 g phones from them.
Ported numbers to consumer cellular new 5 g phones they always work.
Live in the same place go figure pay allot less now too.
At my house, Tmobile works better than Att\verison.