taniwha:there is no option as far as I can see, and believe me, I've looked. I found the manual on Telecoms site, although thats just Nokia's manual, and it doesnt appear to be an option, it just works if the network supports it.
It's there somewhere.. i remember turning it on.. and now i'm sending split message to other people i know who have nokias. I have a 6255 - keep searching them menus.
Well if you know where it is, please let me know, I've not been able to see it. On my Nokia's its been automatic, and the manual didnt show an option?!