Once you activate the divert, any SMS sent to your number will be diverted to the number you request. For example, say that your phone is about to die. You quickly activate the SMS divert to our friend's phone number. Then whenever someone sends a message to you, it will be diverted to your friend. You can identify diverted messages because the sender's number appears with a '+00' in front. +009477712356 for example.

There are some other commands you can use to control and monitor the SMS Divert service.