How come my messages aren't sending?

I have a iPhone 4 and none of my messages will send. Like they will go threw but then it says "message not sent" what's wring with my phone. And I have service so don't say that's the problem. I have only 2 bars though…

Ask your service provider

Sometimes is your provider that locks you down. BUT

You might thank me for this info. Yet, you might thank me forever!

I have Solavei from T-mobile and it gives you twice as much GB of data than than T-mobile itself. Solavei gives you 4GB of data, Unlimited Talking and Unlimited Texing anywhere in the US and International Text too. $49.00 or FREE

The BEST of all? -- you can earn income month after month when you share with your friends.
It's fast! Check your coverage and thank me when you got it!

Here it is --- www.tinyurl.com/SolaveiFREE.

Ps. Email me if you have any questions!
Anthony