Universal Handy Interface

Universal Handy Interface (UHI) is a Motorola designed universal interface for mobile phone use (Motorola, Nokia, Siemens AG, Sony Ericsson, Samsung) in Mercedes-Benz cars.

The mobile phone is placed in a cradle connected to a telephone network unit and operated using the buttons on the multi-function steering wheel. It is controlled by COMAND, a Motorola operating system which also allows SMS messages to be read and edited on the existing dashboard display.{{Cite web|url=https://www.mobile-review.com/exhibition/cebit-motorola-en.shtml|title=CeBIT 2003. Products from Motorola for both pedestrians and drivers-users|website=www.mobile-review.com|date=21 March 2003|access-date=29 June 2021|url-status=live|archive-url=https://web.archive.org/web/20171126143822/http://www.mobile-review.com/exhibition/cebit-motorola-en.shtml|archive-date=26 November 2017}} There are a large number of different cradles now available for various phones.{{Cite web|url=http://www.mercupgrades.com/uhicradles.shtml|title=Mercedes UHI and MHI Phone Cradles|website=www.mercupgrades.com|date=15 April 2008|access-date=29 June 2021|url-status=live|archive-url=https://web.archive.org/web/20200701211704/http://www.mercupgrades.com/Mercedes+UHI+and+MHI+Phone+Cradles-article-9.html|archive-date=1 July 2020}}

The hands-free capability uses the car's on-board audio system and a microphone located underneath the interior roof light.{{Cite web|url=http://www.whnet.com/4x4/radio/uhi_harness.gif|title=UHI harness.gif|website=www.whnet.com|access-date=29 June 2021|url-status=live|archive-url=https://web.archive.org/web/20210115110636/http://www.whnet.com/4x4/radio/uhi_harness.gif|archive-date=15 January 2021}}

Multi-Handset Interface (MHI) is the US sales name for UHI.