If the "your phone is not registered on a network" error has popped up on your Android phone, you know how frustrating it can be. Whether you want to call your family ...

Forbes contributors publish independent expert analyses and insights. Zak Doffman writes about security, surveillance and privacy. Republished on June 27 with new advice and defenses for smartphone ...

Samuel has spent years writing about mobile carriers and their networks following a stint working as a technician in a carrier phone store. Whether it's helping people avoid 36-month payment plans, or ...