First Call Made Using Inmarsat's New Global Handheld

LONDON, January 26 - Inmarsat (LSE: ISAT), the leading provider of global mobile satellite
communications services, announced today that the first call has been made
using its global handheld service, IsatPhone Pro, which is on track for
launch in June 2010. The first images of the new handset have also been
released.

(Photo:
www.newscom.com/cgi-bin/prnh/20100126/375518-a )

(Photo:
www.newscom.com/cgi-bin/prnh/20100126/375518-b )

In preparation for launch, Inmarsat has passed a number of key milestones
in the development of the service and finalised some essential contracts and
distribution arrangements.

A contract to upgrade the Inmarsat ground network was completed on
schedule by Lockheed Martin, and further testing on the integration between
the handset and the ground network is underway.

Inmarsat's partner for the handset development is Sasken Communications
Technologies, which has led development programmes for most of the world's
top mobile phone manufacturers. Elcoteq, the world's third largest
manufacturer of mobile phones, has been appointed to produce IsatPhone Pro at
its facility in Tallinn, Estonia.

Eleven distribution partners, covering all geographic markets around the
world, have been selected to sell IsatPhone Pro at launch: AST, China
Telecom, Evosat, MCN, MVS, Network Innovations, NSSL, Satcom Global, Singtel,
Stratos and Vizada.

"The first call is a significant milestone, and we're very pleased with
the voice quality in initial tests," said Helen Stalker, Commercial Director
of Global Satellite Phone Services.

"IsatPhone Pro is the ultimate combination," she said. "It's a robust
handset that is easy to use, has long battery life, and offers a reliable
global network connection. And it's provided by Inmarsat, the market leader,
with 30 years' experience in providing global mobile satellite services."

IsatPhone Pro is targeted primarily at professional users in the
government, media, aid, oil and gas, mining and construction sectors. It will
offer satellite telephony, with Bluetooth for hands-free use, voicemail, text
and email messaging. Location data will also be available to the user to look
up or send in a text message.

IsatPhone Pro is the first Inmarsat handheld to be purpose-built for its
network. Optimised to deliver the best performance from the world's most
advanced mobile satellite network, it will be available on a global basis
over the three Inmarsat-4 satellites, which have an operational lifetime into
the 2020s.

Note to editors: Selection of high-resolution images of IsatPhone Pro
available.

About Inmarsat

Inmarsat plc (LSE: ISAT) is the leading provider of global
mobile satellite communications. Since 1979, Inmarsat has been providing
reliable voice and high-speed data communications to governments, enterprises
and other organizations, with a range of services that can be used on land,
at sea or in the air. The company's services are delivered through a global
network of more than 500 distribution partners and service providers
operating in 180 countries. For the year ended 31 December 2008, Inmarsat plc
had total revenue of US$ 996.7 million (2007: $576.5 million) with an EBITDA
of US$531.2 million (2007: $388.1 million). For more information, please
visit www.inmarsat.com.

Photo:
www.newscom.com/cgi-bin/prnh/20100126/375518-a

www.newscom.com/cgi-bin/prnh/20100126/375518-b

Media Contacts: John Warehand, PR Manager, Inmarsat, Tel: +44-20-7728-1579, Email: john_warehand at inmarsat.com; Neville Rawlings, On behalf of Inmarsat, Bell Pottinger Business & Brand, Tel: +44-20-7861-2502, Email: nrawlings at bell-pottinger.co.uk