Inventor Judah Klausner added HTC Corp to the list of big phone makers against which he has filed lawsuits alleging infringement of technology patents related to visual voicemail.
Visual voicemail lets phone users see who has left a voicemail and choose which messages they want to hear.
Klausner Technologies said on Monday that HTC's MyTouch 3G mobile phones use Klausner's visual voicemail patented technologies. A U.S. representative for Taiwan's HTC was not immediately available for comment.
Klausner has also sued Motorola Inc and Research In Motion Ltd over the same technology. Klausner has won settlements in the past from Apple Inc and LG Electronics Inc.
(Reporting by Sinead Carew, editing by Gerald E. McCormick)