I currently have a Samsung Exhibit 4G that is barely functioning. I was given a Samsung Galaxy S 4G to use. I and my daughter have both put our SIM cards in the Galaxy but it does not connect to TMobile. It shows bars for service but says "No Service" on screen.
If I go into the mobile network with the SIM card in the Galaxy it shows Tmobile as the APN (I have also reset to default and still Tmobile). When I go into Network operators Search now gives me an error as does default setup. Select automatically tells me "Your SIM card does not allow a connection to this network." My mobile AP works from the Galaxy except for the fact flight mode will not stay turned off.