OS (Iphone) Apps

Currently IOS lacks write support for NFC. However they're a few NFC tag info tools that can read the implants and other NFC tags.

NXP TagInfo

Taginfo NXP - AppleStore

Can see a video of it here in on a xNT.

Other IOS Apps

NFC Reader for Iphone - AppleStore
GoToTags -AppleStore
NFC Ideas - AppleStore