PHP Mobile Device Detect
It is easy to customize it to fit in your code. You can redirect users to mobile content with 3 lines of code! Supported devices/operating systems/browsers: Android Acer Asus Alcatel Siemens Blackberry HTC HP LG Motorola Nokia Palm Samsung SonyEricsson ZTE Mobile iPhone iPod iPad Opera Mini Playstation DoCoMo Benq Vodafone Sharp Kindle Nexus Windows Phone