Good Evening Lin_Mel: I get my Fitbit One the Colorful replacement clip/cases for FITBIT ONE on Amazon. I can find them in my colors and different designs. I have a Navy & Grey one with White polka dots. I thought I just had the 2 from Fitbit the Black & Burgandy. But I get the ones that have a metal piece in them. 2nd unsure w=how their batteries work, all I can do is continue to recharge it? I will cross that bridge If I need to replace my One. But I still enjoy mine, leaving me positive messages. Unsure about the iPhone part? I own an LG thru Tracphone, but I know mine won't sync, I prefer to go thru my hard drive on the computer. Well, I hope this helps you, Decafe2
