Thread: I can send just very short sms

hi everybody, Im really in a big trouble regarding sending sms. I can actually just send the shortest messages that can merely reach 6 to 7 words. I choose GSM from the SMS Service but it doesnt helped. i actually use windows mobile 6.1 with M-Amine rom.
pleeeeeeeeeeeeeeeeeeaaaaaaaaaaaaaazzzzzzzzzzzeeeee eeeeeeee help me if u can. what ever the message text is more than that number i get an error message that this message cannot be sent. so please if any body of u have any idea help me. and of course my htc is polaris..
thanks