[HOLD][#53420683] Updates the "Activate your mobile device to receive sms text notifications" page.

On [HOLD] awaiting review of text content.

![1](https://f.cloud.github.com/assets/2251119/1596313/cf6f2272-52f9-11e3-8a38-575335d62f08.png)

![2](https://f.cloud.github.com/assets/2251119/1596314/d263d996-52f9-11e3-9a20-96978433f521.png)