Why when I send a message from my Phone I dont recieve it but when I send it from the computer I do...

The former president of my fraternity used Tatango and when I became secretary I decided it was time to use this again. But when I send out messages from my cell phone to the members All the contacts receive the messages except for me. I receive this error message:

"Premium messaging to this mobile number has been blocked. Only the account owner may request a change to this setting with his/her wireless service provider."

When in the past I never used to receive this message. But what is even more bazaar is when I send a message from the computer to all contacts. I do receive the message.

Is it supposed to be like this? Thanks!