Does anybody else have a problem with the iphone 3gs mms?

[coley_2000_2000]

I Got an Iphone last week and i went to send a picture message 2 days ago and realised that i didnt even have a send with mms button to press. i have rang my provider and they have informed me that on some models when you update the software to 3.1.3 you can not send or recieve any media files ? has any one else had this problem ?