Would really appreciate some advice,
Last year when I was living in South Korea I bought a Samsung Galaxy S2 and I had no problems with it but since i've been back in the UK every time I text it converts my message into a MMS even though i'm only sending about 80 characters. It's really annoying and means I can only send a few words on each text hah
I've read up online and ive tried downloading some SMS apps such as handcent etc but nothing is working

Any suggestions? I can't afford to buy a new phone currently, desperately trying to fix this.
Thanks,