Can i keep my number if i leave at&t

- Can i keep my sbcglobal email if i leave at&t
- Can i keep my email address if i leave at&t
- Can i keep my yahoo email address if i leave at&t
- Can i keep my bellsouth email address if i leave at&t
- Can i keep my email if i leave talktalk
- Can i keep my nhs email if i leave the nhs
- Can i keep my email address if i leave telstra