Two giants of the mobile phone industry, Apple and Google, have agreed to drop all current patent infringement lawsuits between them, they said Friday.

"Apple and Google have also agreed to work together in some areas of patent reform," the companies said in a joint statement. They have not agreed to cross-license each other's patents, however.

Apple's highest-profile battle with Google began in 2010 when it filed a patent infringement lawsuit against Motorola Mobility at the U.S. International Trade Commission in Washington. That move sparked a countersuit from Apple, and the battle continued after Google purchased Motorola Mobility.

The deal does not cover the long-running patent infringement battle between Apple and Samsung, which uses Google's Android operating system on its phones. Earlier this month a California jury ruled Samsung should pay Apple $119 million for infringement of several of its patents related to smartphones and tablet PCs.

Martyn Williams covers mobile telecoms, Silicon Valley and general technology breaking news for The IDG News Service. Follow Martyn on Twitter at @martyn_williams. Martyn's e-mail address is [email protected]