Nokia 5320
SMS problem

Dear nokia,

I had bought nokia 5320 on last november.

It worked fine for almost 10 months.

But last one month i am facing a serious problem in sending SMS.

When i press send option the newly created message go to inbox and setttled there.

From outbox the message is not going outside and settled in phone itself. In outbox it displays it will resend in certain time.

But when that time arrives a new time will appear and the same continues.

Is there any solution for this.