For some reason my ZL is very picky on what sim card it tries to read. It's only detecting my current T-Mobile sim card. If I put any other sim card in regardless what carrier it's from, the phone will not detect the sim and will display sim card not installed. Yet, the other sim cards work perfectly fine in my iPhone. So it can't be a sim card issue. Now every time I install a sim card I always reboot like what your suppose to do but when the phone powers back on, I still get no sim card installed. However if i put my current T-Mobile sim card in, it detects it.Strange!
