AT&T Customers: Free Galaxy S21 or $800 off S21+/Ultra with Trade-In via 30 Monthly Bill Credits

Samsung has $800 credit towards new galaxy s21 phones, when you trade in one of these phones and buy on a 30 month installment agreement. Details below. I believe you can also claim $100/$150/$200 Samsung credit as well. Costco also has $100/$50 Costco gift card if you order in store.
https://www.att.com/buy/phones/browse/samsung/

UP TO $800 OFF THIS SMARTPHONE
Get up to $800 off an eligible smartphone when you add a new line or upgrade an existing line.

You'll need to:
Purchase an eligible smartphone on a qualifying installment agreement, including taxes on full retail price (up front) and $30 activation/upgrade fee.
Add a new line of service or upgrade an existing line.
Activate postpaid unlimited wireless service (min. $75/mo. for new unlimited customers before discounts).
Trade-in an eligible Smartphone in good working condition with a minimum trade-in value of $95 for $700 credit ($35 for $350 credit) within 30 days of activation.
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Then you'll get:
Up to $800 in bill credits with smartphone trade-in value of $95 or higher (Up to $350 with trade-in value of $35 to $94) applied in equal amounts over 30 monthly installments

Eligible Devices:
Eligible Purchased Smartphones
Samsung Galaxy S21 5G 128GB ($800), 258GB ($850)
Samsung Galaxy S21+ 5G 128GB ($1000), 258GB ($1050)
Samsung Galaxy S21 Ultra 5G 128GB ($1300), 256GB ($1480)


Eligible Trade-in Smartphones:
To qualify for $800 credit, minimum Trade-In value must be $95 or higher after device condition questions have been answered
Eligible devices:
Apple: iPhone 8, 8+, X, XR, XS, XS Max, 11, 11 Pro, 11 Pro Max
Samsung: A71, A71 5G, Fold, Fold 5G, Galaxy S9, Galaxy S9+, Galaxy S9+ Duos, Galaxy S10, Galaxy S10+, Galaxy S10 5G, Galaxy S10e, Galaxy S10 Lite, Galaxy S20, Galaxy S20 Ultra 5G, Galaxy S20+, Note9, Note10, Note10+, Note10+ 5G, Note20 5G, Note20 Ultra 5G, Z Flip 5G
Google: Pixel 4, Pixel 4 XL
LG: V50 ThinQ, V60 ThinQ
OTHER: Asus Rog Phone2, moto razr, OnePlus 7 Pro 5G, OnePlus 7T, OnePlus 7T Pro 5G McLaren, OnePlus 8 5G, OnePlus 8 Pro


To qualify for $350 credit, minimum Trade-In value must be $35 or higher after device condition questions have been answered
Eligible devices:
Apple: iPhone 6S, 6S Plus, iPhone 7, 7 Plus, SE (2nd gen)
Samsung: A11, A20, A20s, A30, A50, A50s, A51, A70, A8+, A9, Galaxy S7, Galaxy S7 Edge, Galaxy S8, Galaxy S8 Active, Galaxy S8 Duos, Galaxy S8+, Note5, Note8
Google: Pixel 2, 2XL, 3, 3 XL, 3a, 3a XL
LG: G7 ThinQ, G7+ ThinQ. G8 ThinQ, G8X ThinQ, K51, Stylo6, V35 ThinQ, V40 ThinQ
OTHER: Moto Z4, RED Hydrogen One, Razer Phone, Razer 2, Huawei P20 Lite, Kyocera DuraForce Pro 2, OnePlus 5, OnePlus 5T, OnePlus 6, OnePlus 6T, OnePlus 7 Pro