Have you heard about Our Pact? A free app to help you control Internet and phone options for your child? It has helpful contracts parents can use to discuss appropriate limits for "screen time" while allowing parents the control to turn their child's devices on and off--thus limiting power struggles.
With the digital age advancing our technological minds, it is important not to lose sight of the importance of exercising our children's "social minds". Devices should be put away when at the dinner table, during visits with relatives, etc. as a form or courtesy but also respect to the people that are right in front of you.
More information can be found at: http://ourpact.com/