Hey there not sure if this is the right place for this but ill try anyway

I recently bought a galaxy S2 from Korea.Ive had no problems with it, I inserted my contract sim into the new phone and text ACTIVE to 2020 to
recieve the config settings. I applied these settings and everything seemed to work fine.

That's what I thought anyway ! Everytime I go over 90 characters when writing a text it wont send..
Im guessing this is something to do with MMS? Im not quite sure what that is but when I reach the 90 character limit
it displays MMS and a character limit of 2000.

Ive tried a few APN settings but I get different results from different configs.
For example: one config will send the MMS but will appear blank on the recieving end another wont even send.