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.
Hereâs the basicsâ¦. SMS stands for Short Message Service, and commonly referred to as text messaging. How does SMS work? At a high level it is very simple but the first thing you need to understand is the difference between Person to Person text messaging (P2P) vs. Application to Person text messaging (A2P). Person to Person (P2P) SMS and the Need for an SMSC.