GrandSlambert

Create widgets to display business contact information. This is not a contact manager as business information is stored in each widget.
<ul>
<li>Business name and address</li>
<li>Up to three business phone numbers</li>
<li>Link to business web site and contact form or email address</li>
</ul>

Business Block Widget

Create widgets to display business contact information.

Maxaud

This plugin allows you to define different CSS rules that get loaded into the page’s for specific devices.
Includes checks for 18 different tablet options and 13 different phone options.
This can be useful if you need to target specific phones or tablets to make CSS changes or show certain advertisements for certain devices.
For more options or if you feel like donating, check out the <a href="http://codecanyon.net/item/mobile-css-pro/3182318/" title="Mobile CSS Pro" rel="nofollow ugc">PRO version of Mobile CSS</a> that is available for purchase.

Mobile CSS

Allows you to define different CSS styles that get loaded for specific mobile devices.

Business Block Widget vs Mobile CSS