I do not think this works. I am a T-Mo customer and am trying to find a way to use my T-Mo phone plus another SIM. It turns out that to get a T-Mo eSIM you have to have a T-Mo prepaid account which does not have roaming. This sucks for me as I was hoping to move a foreign SIM (from a country with no eSIM offers yet) to combine two phones in one and still have T-Mo roaming and other benefits of their postpaid accounts.