In iPhones, is it possible to code the "phone" app. What I want to do is play a sound when the person on the other line hangs up.
If I had a dime for every time I've had an entrepreneur ask me if it's possible to do "video ringers" (video replacing an audio-only ringtone) or "record a conversation straight from the phone app", I'd probably have a couple dollars.
In any event, Apple does not allow developers to modify anything to do with the Phone functionality, as it's considered a security and privacy risk.