T-Mo deal, switcher from AT&T or Verizon

https://www.t-mobile.com/offers/promotionaloffers

Promo: 2020BYODP1
$250 debit card

After rebate via virtual prepaid card. Limited-time offer; subject to change. Qualifying credit, device, service, and port-in from AT&T, Verizon, US Cellular, Spectrum, Claro or Xfinity required. Complete port-in and register code within 30 days of activation. If you have cancelled voice lines in past 90 days, reactivate them first. Get $250 via Virtual Express Prepaid Mastercard® Card, which you can use online, or in-store via accepted mobile payment apps; no cash access & expires in 6 months. Card is issued by MetaBank®, Member FDIC, pursuant to license by Mastercard International Incorporated. Mastercard is a registered trademark of Mastercard International Incorporated. Use of this card constitutes acceptance of the terms and conditions stated in the Cardholder Agreement. Must be active and in good standing when card is processed. Allow 6-8 weeks from fulfillment of offer requirements. Max 4/account. May not be combined with some offers or discounts (e.g., Carrier Freedom).

... wonder if one can sign up on AT&T or Verizon prepaid then switch...

AT&T prepaid: $40/mo
https://www.att.com/buy/wireless/prepaid/plan

Verizon prepaid: $40/mo no autopay

No reason you can't sign up to an mvno and then switch

I’m guessing this is post=paid? and requires minimum number of months of service?

Hm... just went on chat... prepaid does not count... :frowning:

Qualified providers include AT&T, Verizon, US Cellular, Claro, Spectrum Mobile, & Xfinity Mobile.