Both iOS and Android have a "do not disturb" mode where, when enabled, only phone numbers in your contact book will ring your phone. I just leave it on all the

Both iOS and Android have a "do not disturb" mode where, when enabled, only phone numbers in your contact book will ring your phone. I just leave it on all the time. https://support.apple.com/en-us/HT204321 https://support.apple.com/en-us/HT204321 https://support.google.com/pixelphone/answer/6111295 https://support.google.com/pixelphone/answer/6111295 (see "Option 3: Priority notifications only", and pick Contacts Only.)