mobile text centre problem

mrs_baggins

I have a nokia 6131 phone which was originally with O2 now with Vodaphone. since I have changed sim card I am having problem with sending texts. basically after about every 3-4 texts I send when I send the next one it says something like 'unable to send text messages. no message centre number defined. define one now?'. I then have to go into message settings, then text messages, then message centre and choose the vodaphone one which is in there. , save it and send my message. I then have to do this all over again after another 3-4 messages. Any ideas anyone?