When that happens, you might see the "your phone is not registered on a network" on your screen, which means your SIM card can't connect to your wireless provider's network.

Unlike our phones, the SIM cards that connect them to a network have barely evolved over the last decade or so. This can sometimes mean you'll have trouble connecting to a network, even when the phone ...

If you don't spot a connection in the status bar, try ejecting the SIM card tray and inspecting it and the SIM card for any damage. Reinsert it and reboot your phone to see if you have network ...

These two ways of connecting your phone to a cellular network are very different. We tell you about each and how you can switch from one to another.