So if one were to switch from a KYC AT&T iPhone to Graphene/Calyx Pixel Android, couple questions:

1) Graphene OS or CalyxOS?

2) Where do I find a OEM unlocked pixel?

3) Can I keep the same number?

4) After buying phone, how do you sign up with a carrier?

Sorry fellas, new to this. Pretty amateur questions, but it’s time to switch.