first off a big HI to every1

right, i found a 7210 recently , been working fine for about a month with my sim card in, all of a sudden when i turn it on it says 'sim card registation failed' and with a different sim card on a diffrent network it registers but you cannot make a call or receive a call just send txt's

following this i have baught a data cable for the phone and vaugly read somewere that i need to change the serial number of the phone, is this right?

anyway, i have tried a few programs and none of them can seem to recognise that the phone is plugged in, is this because im on Win XP? if so how can i fix this?


all help appriecated

Ryan