I got my unit and have a problem.
Got AT&T Sim and activated it. Tried it in my phone, it receives and sends SMS fine.
Put it in OVMS unit. Plugged into car, antenna connected.
Unit powers up blinking red, then red out, slow blinking green, then solid green, as expected.
Use my iphone to give it "REGISTER OVMS" - no replies ever come.
tried it 20 times... hours. unplugged it, plugged back in, waited for solid green + no red, send command again, no response. ever.
am i missing something or doing something wrong?