Could be similar but few years ago on my state the local phone providers through out the state put in area code now required for all call made even local as for cell service would guess same as all my contacts have area code in them local and others something similar could of happened where you live
This is indeed a strange occurrence. I would like to try some steps here, can you please power off/on the device?
Please let us know how this works out?
We would like for you to do a Network Reset on the device. Resetting network settings won't delete any of your apps or personal data, but will erase saved Wi-Fi passwords and Bluetooth connections.
- From a Home screen, swipe up or down from the center of the display to access the apps screen. These instructions only apply to Standard mode and the default Home screen layout.
- Navigate: Settings. ...
- Tap Reset network settings.
- Review the info then tap Reset settings. ...
- To confirm, review the info then tap Reset.