Hello laurel1957, I remember I went into cellular network settings, deactivated data connection, switched connection speed 2G, 3G, and exit settings. I called from my cellphone to my mom's Lumia 520 but it was only showing the phone#. Not knowing what else to do I went back to cellular network settings and switched things back to normal (activate data connection, set to 3G), called again but still only #s, so I turned it off, then on, called again and it got fix. So far it has been working normally.