I posted a comment on the thread, but i felt i had to repeat this.. The iPhone cannot compete with the... DS.. for a MICROPHONE based aspect. A device which is used for phone calls, voice memos, and god knows what else.
Rockstar obviously thought that iPod touches don't have in-built microphones, (even though the new ones come with mic-headsets) So why bother? That decision = fail, but what can you do? It's not exactly a huge aspect of gameplay.
hold you finger at the top of the screen to the right of the mini map ypu need to hold it there for at least five seconds and be close to a cab with its roof light on
ah so u can? I know touches arent the most microphone friendly ( i own one), but seeing the review saying iPhone couldnt compete with a microphone aspect.. I had the tar and feathers ready =p