Today when I went to sync my Jawbone UP I discovered the end that you plug into your phone was recessed a bit. It made it difficult to plug into my iphone. In the end i was able to sync it but it was obvious the device was broken. I contacted Jawbone support and they are going to send me a replacement unit since this one is under warrantee. I have to just keep this one working until I get my replacement unit. It may take a week to 10 days to get.