@puppygirlhornypost2 @mattly i think the main point is that most home- and almost all mobile networks use NAT. so, connecting from your (NATted) phone to your (NATted) homelab is going to be quite difficult without outside help - this is what the "relay" proto is for:
https://docs.syncthing.net/specs/index.html
wether or not you want your node to participate as a relay node ... now, this is something that maybe they should get consent for. but it does help everyone to turn it on.