[willtheperson]

Is that really possible? I've wanted to do that before and looked into Twilio but it's basically number spoofing and would make spamming people far too easy.

If you've found a way, I'd love to hear it

[chrisdevereux]

There are services that can do this (Skype, for example) but on closer inspection, looks like it's not allowed in some territories (including the US).

https://support.skype.com/en/faq/FA672/how-do-i-show-my-mobi...

http://en.wikipedia.org/wiki/SMS_spoofing

[biot]

Twilio lets you deliver SMS from a number other than your Twilio number. The one caveat is that you need to have Twilio verify the external number first, two-factor auth style.

EDIT: Oops, apparently this is only for voice calling: http://www.twilio.com/help/faq/phone-numbers/whats-the-diffe...