What is an iPhone? How do you use an iPhone? Browse our forums below to find out what questions others just like you have asked and had answered by our members. You can found out how to use iPhone 3, iPhone 4, iPhone 5 and iPhone 6 and how to use iOS on your iPhone by browsing thru our iPhone forums and reading posts to find out answers to your questions. You can even search for questions and read the answers to them in our iPhone forums below.