I started using Motorola Mike phones. They have a feature/setting, Talk Around, that allows you to use the two-way radio even if there is no cell reception, therefore the phones don't have to be activated on a network at all. They work far better than FRS/GMRS radios you get in CT or Walmart. Where we hunt I tested the radios by leaving one at the camp (pretty much middle ground) and going to all the watches and checking to see if the signal would reach, and it did. Our terrain is very hilly and even between two low points the signal was getting through.