So I just read an article in today's Deseret Morning News that talks about the possibility of implementing 10 digit dialing when the new area-code is implemented. I personally think this is a bad idea for many reasons, however, I will only discuss one of them this time.
Young children try to learn their phone number and address in Kindergarten. Most children can memorize a 7 digit number relatively quickly. They then learn their address. If that child were to become lost, they could easily tell someone their 7 digit phone number and that person could make an assumption that the child is local and easily call the child's parents. I don't think children will be able to memorize a 10 digit phone number as easily as a 7 digit one, and if the overlay plan is implemented, it could become a safety issue. Food for thought.