AT&T Galaxy S5 on T-Mobile Network HotSpot and tethering.

[AC Question]

I am using my AT&T Galaxy S5 (SM-G900A) on T-Mobile Network. It is working just fine but the only feature that I can not make work is Mobile HotSpot or Tethering. I get Mobile Data is not available or invalid SIM. Can someone advise please.

 

[Dave Hindle]

Hi did u manage to solve this - having same problem on my AT&T S5 on 3 Network