Drivers can only text by proxy through the Shotgunner. By extension, this includes looking up information on the Internet by cell phone or other connected device, like movie times, parking spaces, navigation, Yelp Reviews, etc.
If the Shotgun rider sees the driver texting and driving, he must scold the driver, take the cell phone away, and assume texting responsibilities.
4.5.1 No Distracting the Driver. Although some vehicles come with hands-free devices, the responsibility of Shotgun is to minimize all non-driving activities done by the driver. This also means Shotgun should not try to add distraction for the driver but showing the latest Vine, Snapchat, YouTube or Facebook post. Enjoy it for yourself and share it once you arrive. Remember you are also the Sentinel