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Neat. Or just use a (real) phone's dialtone, which is E.
Not necessarily. It depends on the installation and does, usually, contain 2 tones. For instance - https://en.wikipedia.org/wiki/Precise_Tone_Plan - none of two frequencies used in NA's dialtone is E.
Ah well it always worked for me... may have been a case of "close enough for rock'n roll" though.
I only get standard, typical search results.

Mobile Chrome, latest Android version.

What exactly is the point the poster tries to make? That there are online guitar tuners? Or does he see different results than I do?
the guitar tuner is integrated into bing itself.
Not to me, as far as I can tell. Perhaps only for some localities, or it depends on something else?