Some parts of the Texas have bans on texting and hands-on phone use, but not all. In the U.S. the Federal Government doesn't have the authority to ban the use of phones in cars. They can create regs that require all cars to have safety belts (Interstate Commerce Clause), but they can't make safety belts mandatory. That's up to individual states. Same thing applies. The Federal Government could possibly require all cars to be produced with hands-free features so that people have an option and the states themselves could require hands-free only in cars.