Very frustrating that I am trying to upgrade both my watch and cell phone, and for over a week T-Mobile app, call center, website and in store give me the same “error message” cannot process payment, call us.
For what is worth, I tried with an amex, master card and visa all from different banks, all of them working, including one of them was just charged through auto-pay for my monthly bill.
I strongly recommend t-mobile systems to fix it in a more prompt way, if not, consider not to offer them? It is easier to go to an amazon or a best buy and just buy the devices, caveat, and also making it easier to switch providers.
Very disappointing to see these type of billing/invoicing systems fail in year 2023 from TMobile - this is not good for business nor longevity.