How to send a USSD Code to mobile phones

Question

I want to send and run a USSD code on mobile phones via PHP. I have an SMS gateway, can I send it through SMS or do I need to purchase an other service? I have been searching the net and didn't come to a solution that's perfect for me.

Some company's support told me that I can send it using XML in SMS.

The USSD command I want to run is :

    1. *21*___SOME NO____#
    2. #21#

Answer 1

USSD and SMS are two different services that are both supported in 3gpp mobile protocols.
Check your documentation, or ask a support engineer at the organisation that supplies your SMS gateway to know if they also support USSD. If yes, then they should give you details on how to use it.

The interface to a USSD gateway is not standard, it will depend on how the individual company has implemented it.

A quick search on Google for the words "ussd gateway" brings up several USSD products.