Our whole family got Striiv Bands for Christmas. We love them! Way better than any other fitness band we've tried! My husband and I have Nexus 5s and the app needs a bit of work but is really very good. Our son has an iPhone 5 and everything works great. The iphone ap is definitely more developed than the Android. Our daughter has an iPhone 4s and she doesn't have the square for My Land or the option to add friends! She has a walk-a-thon square in that place. Her phone is updated to the latest ios version and so is the ap. Any ideas?! We want her to compete with us!! TIA!!