Hello, I am having the same issue here. I had my rootfs full, so I started deleting apps. Later, I rebooted the N900, and the simcard was suddenly not recognized. Tried other simcards from other operators, but for no effect. Rebooted again, flashed the latest firmware (tried US and Global), but nothing seems to help. The device takes a longer time to boot than before, probably trying to connect to the operator. All other functions work properly.