Note 10 BOGO Promo Question

I don't work for Tmobile but all these Bogo offers have different requirements.

If the credits don't start for up to 90 days and you were to cancel the other line before then you will lose the credits

since you basically haven't added a line.

You can try contacting Tmobile support using messenger through Facebook or Twitter and get a better answer.

Deals & Promotions | Deals On Phones, Tablets & Accessories | T-Mobile

Buy a Samsung Galaxy Note10 or Note10+, get a Note10 FREE.

When you add a line with a Plus plan.

If you cancel wireless service before receiving 24 bill credits, credits stop and remaining device balance at full price is due on both devices; contact us before canceling to instead make monthly balance payments. Tax on pre-credit price due at sale. Limited time offer; subject to change. Qualifying credit, Plus plan, additional line (2+ total), & finance agreements required. If you have canceled voice lines in past 90 days, reactivate them first. Note10: $0 down + $39.59/mo. x 24, pre-credit price: $949.99; Note10+: $149.99 down + $39.59/mo. x 24, pre-credit price: $1,099.99. 0% APR. Up to $950 in bill credits on lower-priced device. $10 SIM card, and, in stores & on customer service calls, $20 assisted or upgrade support charge may be required. Must be active and in good standing to receive credits; allow 2 bill cycles. Max 6 free or discounted devices/account. May not be combined with some offers or discounts (e.g. Carrier Freedom).