What happens when you type a web address and press Enter
HTTPS certificates: how your browser knows it talks to the real website
Your browser can lock its connection to a website. But a lock does not help if a stranger sits at the other end. How does your browser check that it talks to the real website?
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Here is the danger. A machine on the way could answer in place of the server, build one key with your phone and another with the server, and read everything it passes along.
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Asking does not help: that machine can say "I am en.wikipedia.org" in the very same words as the real server. From where your phone stands, the two look exactly alike.
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