I have a new 12 Pro Max on AT&T, which has spotty 5G coverage in my city (and none at my house). I looked at the Verizon 5G coverage map and it's much greater in my city and covers my neighborhood. What is the best way for me to get a Verizon SIM card and test 5G without going to Verizon and setting up an account? I just want to test before (if) committing to switching to Verizon from AT&T.