Is there a jailbroken or App Store app that can identify which carrier an incoming caller is calling from? Ideally, the carrier/network would appear as some sort of indicator near the caller's name or picture.
I guess I'm not so interested in learning which carrier the caller is with, just whether they are on the same one as me, so I know whether I'm using minutes or on mobile-to-mobile. I know on AT&T's web site, you can enter numbers (don't know if they still have it, but you used to be able to do up to five at a time) into a screen that will come back with which numbers are in the network.