GX10 txt messaging problem

Heres a headbasher for y'all to help me solve (if anyone can help it would be v.much appreciated).
My mate has just got a GX10 (voda branded) its unlocked but no matter what sim you put in it, it wont send txt messages? :-?
Ive checked all the settings.......message centre number........on o2 and even on voda.
Ive tried it on my platinum clip (had to cos he didnt know the handset code to do a master reset)..........but still it wont send txt messages? :???:
He's even phoned o2 for the settings to set the phone up for their txt messaging service but still it wont have it? :???:
The phone aint blocked because you can still make voice calls on any network.
Any suggestions lads? (other than a full software flash) or do u think flashing is the only option?
Is it possible there could be a hardware fault maybe?
Or perhapse its in need of a good hard toe punt with my size 12 boots? :lol:
Maybe "smarties" will have the answer? :lol:

Any suggestions, ideas, witty remarks or extremely funny replies will be most welcome and appreciated. :P
Cheers.

P.S. a "sharp" reply if poss. (had to get that last one in there he he)