Do you remember when cell phones first came out? If you were with Verizon and you wanted to switch to Sprint, you actually had to change phone numbers! Think about how that would impact your world today. We switch from company to company, go-between social apps all day long, never worrying that our “profile” our data, won’t follow us.
In the mid-2000s the FCC finally made the determination that we should be able to move our phone number from one carrier to the next. Our phone number was part of our personal data. It’s how people recognized us.