This is very interesting... I bought a charge cable from a local shop here, made by Body Glove... it's not working with my 5s, as it says that normal thing that it's not certified etc etc. My daughter do have the iPhone 5... and it's working 100% with her phone ... NO messages etc etc. Is it something in the 5s that Apple put in? It's definitely not the cable and not the ios as we both are updated to the 7.0.4. version.