signal troble on my nokia 5233
when i calling my phone signal icon got nil.then display connection err and disconect the call.how i fix it?
crwdns2934109:0crwdne2934109:0
crwdns2889612:0crwdne2889612:0
0
crwdns2936751:024crwdne2936751:0 0
crwdns2936753:07crwdne2936753:0 0
crwdns2936753:030crwdne2936753:0 0
crwdns2942667:0crwdne2942667:0 253