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?
I only get standard, typical search results.
Mobile Chrome, latest Android version.
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.