For this reason you could lose the phone number of your contacts

How to synchronize the Google account so that it saves a phone number

Google accounts identify a specific user, collecting data about the person to facilitate the use of certain applications, as well as sending information to providers to detect possible errors. Among the services they offer, one of the most used is synchronization, which links an account to a certain device, so that everything stored, such as a telephone number, remains in Google's own digital space and can be accessible when opening session with the origin mail.

The new Google Play update indicates that this automatic saving option can be disabled; but that the data collected so far will disappear from the device. It should be noted that one of the most comfortable functions is to connect the contacts so that the telephone number and other data are saved to be able to communicate with them. However, when making this change they will be lost at the moment, although they can be enabled again from the official Google contacts page, where they can be restored.