Send SMS while creating Customer Master Record using XD01?

Hi Experts,

We have a requirement that " Send SMS from XD01 (customer Master)". Send SMS to customer's mobile after successfully creating customer master record by pressing SAVE button in XD01 tcode.

Successfully, sending SMS through the ABAP program.

How to send SMS from XD01 tcode? I tried using USER-EXIT "SAPMF02D", but it is not sending and giving error message. If I send through the program, it is sending and working fine.

Whether I have to use Work Flows or any other solutions?

Please help me out.

thanks in advance.

Regards

Saray.