How to Text Messages
If you can't talk and want to text instead, you can use the Call Alert feature to accomplish this. Call Alert is normally used for emergencies and emits a loud persistent beep, along with an optional text message of 140 characters maximum. The text messages are also saved in history. To use Call Alert as a texting feature, you can turn off the audio beeps by using these steps:
1. Go to Options>Alerts (or Alert tone / vibrate)>Call alert (or incoming alert). Turn alert setting OFF.
2. Tap on the Call Alert icon on the contact's talk screen to text a message: