On mobile devices, you need to implement OAuth through social networks (Facebook, VK, Odnoklassniki). From the mobile browser, authorization needs to be redirected to the installed social network application, and authorizing through it bypassing the opening of a new tab in the browser (because, from mobile devices, there are rarely anyone on social networks sitting in the browser that means there can be problems with authorization). From the application link should go back to the site.

  • You did not ask a question, but simply described the mechanism. What is your question? - Kernel Panic
  • I apologize, the question is: is it possible, in principle, to authenticate through the application from the browser? - Alexander Konarev

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