Settings number source from mail() sms

I am sending SMS via php mail() function to an address resembling

1234567890@txt.att.net

开发者_运维百科Everything works great but I would like the ability to change the source number so that when I get the message the number displayed is always consistent.

Is this possible?

I have no interest in using API's or paid or free services. Is this possible to change in the headers or will I have to jump through several hoops to accomplish this?

Thanks!

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No. This would obviously be chaos if you could, since everyone would be sending texts while pretending to be someone else.

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will entirely depend on the sms gateway you use.