The likely outcome is that the phone system becomes massively more locked down. Your phone will only ring if the caller has a number which is backed by a real ID, particularly one from your own country. It will become increasingly difficult to contact someone you don’t have a legitimate connection to.

The banking system will become increasingly fraud resilient with better real time detection of fraud.

Your phone may even have its own AI on your side listening in on the call and sounding the alarm when a number from Nigeria starts using an AI voice pretending to be your son.