My phone won't let me send multiple texts anymore 4 some reason. Text messages that are 1 text long send fine, but when I go over the 160 character limit and go onto a second text, when i go to send it the text it fails and doesn't get sent. I've tried restoring the factory settings but i still have this problem.
Any ideas anybody? :s

Just a stab in the dark but have you tried installing the SMS Accelerator patch from Nokia? It may fiddle with things enough to put them right.

Or do the firmware upgrade, because SMS apatch is already inside the new versions.