So, I've just got my Nokia Lumia 920 back from repair (Nokia Care Store). But there's a new problem. Same SIM card, same position, etc. HTC gets full 3G signal. Nokia thinks there's no signal available (the HTC can get online, the Nokia can't). Does anyone know what's happened? Before the repair, my HTC and Nokia would get similar levels of signal, but now there's this huge discrepancy. Anything I can do to fix it? I've done flight mode toggle, reboots, etc.