Please Read Release Notes Here: https://www.sultantheme.com/tag/vb4-responsive/page/2/
What you are going to buy is a fully responsive vbulletin 4 styles in one package. vbulletin 4 is popular forum software that came with mobile style. But that mobile style is so stripped. That it look minimal and less powered featured.
This style is not separate desktop and mobile style. It is one style, it will fall into responsive mode when in mobile.
You need to do 2 important settings as listed in readme txt that provided with the zip.
(1)The asset manager cannot be working in mobile because the file drag system, it need to be disabled then your vb4 will use its less cluttered attachment manager like vb3, and this attachment manager is working in my vb4 responsive styles. Default vb mobile style cannot upload attachments.
(2)You need to set the old mobile browser and modern mobile browser to none in style & language settings.
I have made responsive in many pages it has beside of main pages.That include usercp, faq, pm, user online, search results, advance search and many more. It also support Blog and CMS for vb4 suites.
It support big images responsive, bb code html, bbcode quote and attachment. All will look good in postbit.
It also support responsive youtube bb code.
Postbit legacy and normal posbit also responsive. Postbit legacy will fall into normal horizontal postbit when in mobile. The font icon is called in our style folder and is selected icons only. So it is lighter weight and supported older IE such as IE8 and IE7. But windows phones8 mostly are using IE9.
Please try it first in mobile before you purchase.
We tested it working wonderful in iPhones, Androids and Windows phone.
Demo forum is here