Here is some brief information regarding ad networks that run iPhone inventory:
Monthly iPhone impressions 58MM
Ad units available: Expanding, click to video, click to audio, click to call, click to maps, click to iTunes, and click to App store
Monthly iPhone impressions 10MM
Ad units available: Expanding, click to video, click to call, click to maps, click to iTunes, and click to App store
Monthly iPhone impressions 75MM
Ad units available: Click to video, click to call, click to maps, click to iTunes, and click to App store
Monthly iPhone impressions 110MM
Ad units available: Expanding, carousel, and duel orientation
NOTE: Please contact these companies for more up-to-date information. Thank you.
