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COX Mobile has 500 instant off for 15 pro and 15 pro max.
$ 450 off for 15 and 15+.
Existing phone lines can upgrade too.

Rep was not sure if you would lose out any 500 GC promo from 9/22 if you were upgrading on that existing deal line. Better to open a new line..

https://www.cox.com/residential/mobile.html

Deal ends 12/3. Not clear if phone would be unlocked right away since you can pay in full. Asks your SSN for soft pull even if you are not financing.