How do different mobile carriers not set up new customers with the same phone number?

Question

How does a new T-Mobile customer and Verizon customer not get the same number? Do companies share the same number generator? How can Apple systems tell a number doesn’t come from apple messager?

In: 6

Answer 1

In the US (which I guess you’re asking about, if you’re asking about Verizon) it’s handled through an organization called NANPA: https://nationalnanpa.com which is a registry of phone numbers, from which carriers like Verizon buy blocks of numbers.

I’m not sure what you mean regarding Apple systems.