i have a nokia phone. it use to work with a MTN simcard so i presume it may be network locked. i've put a Vodacom simcard into it on the weekend and it was working 100%. this morning at about 11am i wanted to call someone, and as i was scrolling through the numbers on my phone, the phone froze. agter moering it and shouting it eventually came alive again (defrosted) but a few seconds later it said SIM REJECTED. now thats all it says, i've tried taking it apart and putting it back together again. but still the moment you put it on, even before you put the pincode in, it says SIM REJECTED. could this be because it mayu be a MTN blocked phone? if yes, why did it work 4 days? if no, how do i fix it?