users see my SMS messages as coming from '1010100001'

In my application, I ask the user to enter their cell and select their provider. I append the provider's email and create the message and 开发者_如何学编程fire via php.mail()

The problem is that no matter what the header info is, the message comes from '1010100001' on some phones (like AT&T and the iPhone). When testing on my Verizon phone, I get the proper email address as the sender.

Any idea how I can send a clearer message?

Your problem is that you're not actually sending SMS messages, you're sending email messages and then trusting the carrier's email-to-sms gateway to "do the right thing."

To have better control over the SMS message, send the SMS message directly. For low volume, try Twilio SMS Service