Default Mobile Style change url?

[gnrx]

Hello.
I use default mobile style in my vb 4.2.5, I view others site that, when you access by smartphone, the url changes to: m.yourforum.com
Is this possible in vb 4.2.5?

Thanks and regards!

[final kaoss]

Is there any specific reason you would want a subdomain for mobile users?

[gnrx]

I have read on the internet that Google indexes better when it detects these options.
If a search of the forum is made and it detects this option of mobile, it automatically has a better indexation and results of the search.
(I do not really know if it becomes 100% true) but every time I have more users in mobile version.
Other sites that I use as a reference to configure some aspects, I have detected this. If those sites, which are enormously large, do so, it must be because of the aforementioned or perhaps for another reason that you do not know and does not have the importance that I have deduced.
I must also mention that those other sites that I have used as reference, the mobile style, is a bit different, even though I use it, one vb 3.8 the other vb 4.2.5.

Thanks and regards.

[final kaoss]

You can try to do this with cloudflare. It has this option.

Mobile Redirect
Redirect visitors that are using mobile devices to a mobile-optimized website.

What does Mobile Redirect do?
Mobile Redirect automatically redirects visitors using mobile devices to a website specifically for those devices.

Cloudflare redirects visitors at the edge. This avoids a request to your origin server, directing visitors to your mobile-optimized website even faster.

Cloudflare must be enabled on %{name} or www.%{name} to use Mobile redirect.

What Mobile Redirect setting should I use?
Drop path: Redirect all mobile requests to your mobile-optimized website homepage.
Example: http://%{name}/page.html → http://mobile.%{name}
Keep path: Redirect all mobile requests to the same resource hosted on your mobile-optimized website.
Example: http://%{name}/page.html → http://mobile.%{name}/page.html

[gnrx]

Thanks final kaoss,
I go to view and try this in cloudflare.
Regards.