Phone Trouble

Wondering if someone can help me with a phone problem I'm having.
My phone, which is on TalkMobile, won't send texts, but it will do everything.
Customer Service mentioned a Message Centre Number, although I'm not sure what the significance of it is.
The strange thing is, I had a similar phone (Both LG, except this one is a different model) on this network and the first worked fine.
It was taken :\ which is why I replaced. Same SIM is being used as TalkMobile did something that let me keep my number.
I ran over my contract last month, so that might be relevant, but my balance says I still have 200 free texts (which is how many I get each month)
Can anyone help me out?
 
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