How Google Play services can use your Phone permission
To verify your phone number
If you opt-in to phone number verification, Google Play services may access your phone information in the background to discover and verify the phone number associated with your Google Account.
Tip: To manage your phone number verification settings, on your Android device, open Settings Google Manage your Google Account Personal Info Phone. You can also visit https://myaccount.google.com/phone.
To detect your mobile network type
To keep your device up to date
To help find a lost device
Google Play services allows you to specify a phone number, through Find My Device, so that someone can call you if you lose your device.
Tip: To manage your Find My Device settings, on your Android device, open Settings Google Find My Device.
To improve security
How Google handles your information
In order to enable some features, Google Play Services may collect and send some information to Google which may include crash logs and diagnostics information for analytics purposes. Any information that Google collects is handled in accordance with Google's Privacy Policy.