Hi guys, first time poster hoping someone has an answer to this weird problem.

Just bought second hand N900, upgraded from N97 (Long suffering user might I add lol).

Anyway I can send & receive SMS to any contact except for one, the most frequent one (my girlfriend). A delivery receipt will not come up for her no matter what I have tried, deleting conversation thread, deleting her contact, re adding, re-adding as a different name and sending with the number not as a contact

I can call the number and hers can call mine, she can send me sms but I cant send her and it is fine for any other number I send a sms to delivery report and all. Note im not getting a failed delivery report for the number, nothing comes up.

Any suggestions??

note, the phone is running pr1.2 and was flashed before i purchased