User Activity

I would like to upgrade my phone in the near future, but I do not want to be locked into 3 years monthly off payments. bit I can not see any means to make a one off payment for any of the phones. Advice please. Terry.
I have a Samsung S23 that is four years old and was on "Virgin Mobile". Just lately I have stopped receiving texts messages. I have check ed the network it seem to be fine. I am still using the "Virgin Mobile SIM" card should I replace the SIM card f...