If you can't update or restore your iPhone, iPad, or iPod touch. You can put your iOS device in recovery mode and then restore it with iTunes. In these situations, you might need to use recovery mode to restore your device: 1  iTunes doesn't recognize your device or says it's in recovery mode.
Text messaging, or texting, is the act of composing and sending brief, electronic messages between two or more mobile phones, or fixed or portable devices over a phone network.
Short Message Service (SMS) is a text messaging service component of telephone, World Wide Web, and mobile telephony systems. It uses standardized communications protocols to enable fixedline or mobile phone devices to exchange short text messages. SMS was the most widely used data application, with an estimated 3.5 billion active users, or about 80% of all mobile phone subscribers, at the end of 2010.