I use an app on my Galaxy S 9 called ConnectBot to SSH into my home network (including RPi’s). On my router I forward an external port to an internal port for each host. For example my connection looks like :9001. My router forwards traffic on port 9001 to :80. Thus I connect to 35.137.219.xxx:9001 which is then forwarded to 192.168.1.xxx:80 on the RPi. I have about 50 devices (tv’s, door locks, pc’s, HVAC, RPi’s, IoT) on my home network that I can connect to remotely. Once defined into your router the connections can be named to make connecting easy. This same setup can be used with a browser on any device.
