I don't think the 4 is compatible with iOS7, but I don't know that (based on their history, the 4S would be the oldest compatible phone). Connect it to iTunes and click on the "Check for Updates" button, and it'll tell you which version it wants to install; you can cancel if you don't want it to install.I have an iPhone 4 still running on iOS5. Does anyone know if I can just upgrade it to iOS6 or will it force me to upgrade it to iOS7 if I try and do any upgrade now?