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Why hasn't anybody built up a cell phone protocol that sends you contact information from cell phone to cell phone? The reason I ask is because I've seen this situation unfold far too many times:

Bob: "Yeah, get in touch with Horace."
(muffled conversation from other end)
Bob: "Oh you don't have his number? Hold on a sec."
Bob: "Ok... you ready?"
(Bob hits up a few times, then hits the keypad a few times)
(Bob stares at the number for a second)
Bob: "It's 555..."
(Bob, in his busy little mind, is incapable of memorizing a full phone number at once, so he looks at the phone once again)
Bob: "You get that? Ok.. 555-5555"
(muffled conversation)
Bob: "Hold on, lemme double check..."
(Bob looks back at the number)
Bob: "Yeah, it's 555-5555."

Inevitably, sometimes the person on the other end forgets the number and calls back and the whole process is repeated. Besides looking absolutely retarded and ackward ... why isn't there a simple "Send phone number to current caller?" feature? Like the same way dialtone phones work; if the cell phone picks up any type of dialtone; it displays teh number on the screen of the receiver much as if they typed them.

Anyone?