Apple issues security update for the almost 10-year-old iPhone 5S
Can these still be connected to the AT&T or Verizon networks?  When I tried attaching one in 2020 they immediately disabled my sim card (irreversibly) and when I called support told me it was much too old and I must get a newer phone (thanks a lot, ATT).To be fair, this is often the claimed solution with AT&T and at least sometimes I'm certain it's BS (e.g. for a Samsung S10e, Verizon told my elderly friend the same thing last year).  Hence my question.