How to make the transition from the mobile version of the site to the full version and is it worth it?

Question

Search Engine Optimization

Please tell me:
The customer has a website, mysite.ru.
There is a mobile version of m.mysite.ru
When accessing mysite.ru from a mobile phone, we force a redirect to m.mysite.ru (based on browser headers)
The customer wants the mobile version to have a "full version" link leading to mysite.ru
Questions Q :
Is it really worth it? It is clear that when you go to mysite.ru, you can analyze the referer and not redirect back to mobile if you switched from mobile. But is it necessary? Will search engines consider this behavior as cloaking or simply inappropriate behavior of the site? It's strange somehow, the same page on the same device in one case redirects, in the other it doesn't.
If it's worth it, how exactly? Subtle questions immediately arise, the person on the mobile switched to the full version, which means you need to write in cookies that you switched to the site from the mobile, because on the full version he will most likely start walking through the internal pages. What if he closed the site and reopened the full version? Should it be redirected to the mobile version? What if he pressed F5?

Answer 1

Is it even worth it to do so?

Well, if the customer asks, then it is necessary. Add a title that will be a flag of the visitor's conscious choice. In general, a separate mobile version with modern technologies is strange.

Answer 2

The customer wants the mobile version to have a "full version" link leading to mysite.ru
Is it worth doing this at all?

A simple transition to the full version is needed. Even on the toaster, the mobile version is cut down, and if I want to quote someone (as I do now), I switch to the full version so that the toolbar appears.
As for the method of implementation and likely sanctions, ask the Yandex and Google TP, they are adequate guys and respond quickly.

Answer 3

I think that it is necessary to make the transition to the full version. I use this feature on a regular basis.
It is worth doing a button in the footer "Full version". There will be no sanctions from the PS,
this is a normal practice. When reloading the page, moving to another page, when leaving and entering the site on those pages that he has already visited or no less than 12-24 hours after the first visit, we still show the full version.
You can also arrange the "Mobile version" button in the same place so that a person knows where to poke if you need to go to the mobile version.