The iPhone is a cellular telephone, iPod and Internet-enabled mini-computer marketed and sold by Apple Inc. IPhone features include a camera, visual voicemail, a portable media player, a touch screen, email and Wi-Fi connectivity. Also, iPhone is part of Global Systems for Mobile Communications (GSM), which operates on global GSM networks. One of the features of GSM-compatible telephones is the ability to insert chips, or Subscriber Identity Module (SIM) cards, into the cellphone. A SIM card allows users to change phones easily by removing the SIM card from one cellphone and inserting it into another. With that, all their information is moved from the old phone to the new one. Tips Warnings Writer Bio
