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Bestbuy selling Ssmsung A13 Tmobile Locked for $ 79 . you can use your existing line to upgrade or add new line. Bestbuy does not charge any upgrade or new activation fee so phone will be $ 79 + tax.
Phonr will be unlocked after 40 days. You can request @tmobile Help on twitter to get it unlock early as its already paid off. YMMV , though.
Good backup phone.