Imagine an old site with several pages and not responsive. From then on, a responsive version was created for this same site, each of which has its corresponding link, as follows:
Versão normal: www.site.com.br/
Versão mobile: www.site.com.br/mobile
Note: both versions are fully independent.
In this case, when using your computer or smartphone, you can switch between the two versions, since there is a link in the footer of the site to access its alternative version.
The problem is that when we search for the site by Google from a mobile device, it displays the url of the old version and not the responsive one, which has been implemented recently. I would like to know how I can do it so that it already opens the respective function according to the device.
I have already used functions to force the corresponding version to open according to the type of operating system, for example, however, this prevents the user from switching between the versions.
What can be done in this case?