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.
The technology behind text messaging is SMS (short message service). SMS is used to send and receive messages to and from cellular phones. SMS has its limitations since it only allows for up to 160 characters in the messages. The 160-character limit is only for Latin letters, numbers and symbols.