PHP Mobile Phone Detection Scripts is very good and just released today. With this class you can easely detect mobile devices. This class is very easy to use and support lots of mobile devices, even the new Mac iPad. Check out demo page and see all the futures of this script that you will love.
Opera mini devices
Generic devices like PSP , PDA, wap phones, ….
PHP Mobile Phone Detection only sold for $4 yes its true and you will love it because has a great support and there is many other scripts waiting for you to discover now. You can always select pre paid options and might be able to get it only for $2.