4 pane comic of dolan on the left and spooderman on the right
pane 1 (dolan): cum join opensurce cummunity!
pane 2 (spooderman): shure! how joyn?
pane 3 (dolan): Here discord! (with discord logo)
pane 4 (spooderman with tears in eyes): y u do dis?
A phone number is not strictly required. They use it for some verifications, like suspicious activity. You can switch the number to whichever account needs it at the time, but only one login can have that phone number.