I googled this: how do you right click on a cell phone to view source?
I use a desktop web browser myself to view source as it is easier.
This works in Firefox cell phone web browser and no longer works in Chrome:
Go to any website then tap on the url address bar and a slider should appear. Drag the slider to the far left so you see the http beginning.
Now type in front with no space then afterward press the Go button:
Type just this: view-source:
Example: view-source:https://freerepublic.com