False
Device Protection may only be added during a “qualifying event”. Typically, this is within 14 days of the purchase (order date) of a T-Mobile USA branded device from an authorized T-Mobile channel (T-Mobile retail stores nationwide, authorized postpaid dealers, Costco, Customer Care, for existing customers, T-Mobile.com, and Telesales, 1-800-T-Mobile). Additionally, there are occasional “open enrollment” periods. Qualifying events apply to new customers and existing customers who are upgrading their device.
Source: https://uncarrier.t-mobile.com/premium-device-protection-plans
OP asked about Jump or JoD. You answered something that wasn’t asked.