Page 1 of help needed with mms on gx20

Hi, i have a sharp gx20 and everytime i send or receive mms picture messages they are really small, even though they are sent from full screen pictures.
The person i`m sending pics to has a sharp gx25 and they have the same problem.
I`d like to send my mms pics so that they are full screen.when i receive them at the mo they are just thumnail size.
please help.