I can't figure out how to get airdrop. Can I even use it with a iPhone 4S?
AirDrop is available on iPhone 5 or later, iPad (4th generation), iPad mini, and iPod touch (5th generation) and requires an iCloud account.
fine print of http://www.apple.com/ios/whats-new/
To get it on iPhone 4s follow these instructions. Settings-General-restrictions-airdrop
As stated, AirDrop is NOT available on an iPhone 4 or 4S.
Retrieving data ...