LB1120 3g with ATT
I recently bought a LB1120, and a prepaid ATT sim to use as my internet at home. I set everything up, and instantly saw 4G speeds...for about 3 minutes. It then went down to 3g and has stayed there ever since. I have two bars showing on the modem. I have done a factory reset multiple times. IM not sure where to go from here, would an antenna do anything?