It may worth mentioning that both those tutorials are made for local use (server and Electrum on same computer).
So for accessing it from mobile that may need a little more configuration.
As it seems to be a private/home solution, testing connection in the same network should give the answer if all is configured properly.
For access from outside, probably router configuration should be checked, if static ip is used (or dynamic dns solution). Or server should be configured to use TOR. Anyway - it means computer must be switched on the whole time. I think sooner or later OP will come to the conclusion that a separate machine for that purpose is a better solution (PI or NUC etc).
I 've alreade come to this conclusion my friend...
I mean, for real, it took me approximately 30seconds to realize what you say. Both for performance and privacy reasons, I believe I should have a dedicated system to run as a bitcoin node.
Moreover, I am thinking of buying a machine and running mynode software to it... We 'll see. But thanks for pointing that out.