It appears that you are using the name "iPhone" as a key item in the game. The name iPhone is an Apple (R) trademark and you must have legal permission from the company to use the trademark. I know that Nintendo and Gamefreak have a trademark on Pokemon, but I believe that the Pokemon name and etc. can be used for non-profit purposes. Apple however, is not the same. Don't look at this as nagging, look at it as a heads-up.
Legal Trademark Guidelines
Doubt he will get in trouble for it as yeah that would look great for them, Apple moaning at a guy who's making a fan game.