Coming up in the next version, Q
The fault lies mainly with the mobile operators, who insert in the contracts we sign illegible clauses for which they are allowed to spread our number to third parties. Not surprisingly, one of them, the American T-Mobile, is already working to offer an automatic spam blocking service included in its SIMs. But meanwhile the calls keep coming.
That's why, starting with the next version of Android, called Q, Google will provide four settings dedicated to phone security. We will be able to automatically block the numbers not in our phonebook, the hidden and private numbers and finally the calls from pay phones.
Some steps forward had already been made by inserting a filter to the suspicious numbers that can be activated from Phone Settings on Android. The option is called "Caller ID and spam" . By activating it you can not receive notifications from numbers considered unreliable by the Google database. This is not yet an exact science but can help prevent at least some of the annoyances caused by telephone spam until Android Q is released.