Infinite scrolling, Ajax, Phone or PC?

 Hello.

   How can I make Infinite scrolling html? example: https://www.megacom.kg/hype/ru.html#instruction

   How can I go from first url to another without reloading the website?

   How can I know if the user is entering my website from phone or pc? If user is entering from phone it should show the Whatsapp button and If user is entering from PC it should hide it.

" I can't find any place to ask this thing, and this place might be the wrong place. SORRY if it is like that. If you can answer even one of this answer it plz "

Thank you ♪

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