I must charge my iPhone 4s and I left the end plug at friend's house far away.Can I plug my iPhone 4s into my MacBookAir to charge the iPhone? thanks!🙂
Yeah go ahead. iTunes might pop up and ask to sync, but just say No or close it out or cancel. It'll pull power from the MBP and charger and give your phone a charge. Not as quick as a wall charger but the simple answer is yes - it will charge it.