[macky801]

Is there any way to set a default signature and callback number for every SMS sent from the iPhone?

[Sidetalker]

Its not possible without jailbreaking and I don't know of any 3rd party apps that would make it possible. So no. I don't think so.

[macky801]

Ya, I have jailbreaked.

[fat x nub]

another way Apple screwed up SMS