FOR IMMEDIATE RELEASE

SMITH MICRO ANNOUNCES 5TH ANNUAL CHARITY DRIVE ALL PROCEEDS TO BE DONATED
TO PEOPLE AFFECTED BY HURRICANE KATRINA

$1 Of Every Sale Conducted Via The Company’s Websites Over The Next 30 Days
To Be Donated To American Red Cross and America’s Second Harvest

Aliso Viejo, CA – September 13, 2005 – Smith Micro Software Inc. (NASDAQ:
SMSI) today announced it will continue the annual tradition of it’s Allume
Systems division by donating $1 of each sale from its Websites over the
next 30 days to help national and local charities. This year the company
will donate all proceeds to the American Red Cross and America’s Second
Harvest to help the people affected by Hurricane Katrina.

“When Allume Systems became part of the Smith Micro family in July we
decided to continue their tradition of giving,” said William W. Smith, Jr.,
President & CEO of Smith Micro Software. “The devastation cause by
Hurricane Katrina and needs of the people of the Gulf states only
highlights the need to give back to the community.”

In addition to this annual charity drive, the company is matching every
employee’s donations to the American Red Cross to help the people affected
by Hurricane Katrina.

You can find out more about the work being preformed by American Red Cross
and America’s Second Harvest by visiting their websites at:
www.redcross.org or www.secondharvest.org.

About Smith Micro Software:

Smith Micro Software, Inc., headquartered in Aliso Viejo, CA, is a
developer and marketer of wireless communication, broadband and utility
software products for multiple OS platforms. The company designs integrated
cross platform, easy-to-use software for personal computing and business
solutions around the world. With a focus on Wireless and Broadband
technologies and the Internet, the company’s products and services enable
wireless communications, file compression, eCommerce, eBusiness, Internet
communications (voice-over-IP), video conferencing, network fax, and
traditional computer telephony. Allume Systems, Inc., a division of Smith
Micro, develops and publishes award-winning software solutions for Windows
and Macintosh. Leading brands are StuffIt, Internet Cleanup and Spring
Cleaning. Allume’s software offers a range of solutions, empowering users
in the areas of information access, removal, recovery, security, and
Internet distribution. Smith Micro’s and Allume’s complete line of products
are available primarily online at the company’s websites, through our
enterprise direct sales efforts, retailers, and through original equipment
manufacturers (OEMs),. Smith Micro’s common stock trades on The Nasdaq
Stock Market under the symbol SMSI. For more information, contact Smith
Micro at (949) 362-5800 or visit the company’s Web site at
www.smithmicro.com.