Seven Things to Consider When Choosing a PDA by Jason Kohrs
... This figure may indicate battery life of up to several days on one charge, but under more intensive operation, the battery life could be cut significantly. Watching a movie, listening to audio files, or playing games may drop the life on one charge from a few days down to a few hours. Use of wireless networking and display backlighting are two other things that can seriously impact battery life on any PDA, regardless of the type or quality of batteries included.
Top 10 GSM Phones that "Really" Matter by Saquib Hussain
... The tri-band phone has 80MB internal memory with memory card support of 4GB, and standard office application as well as support for download and installation of tens of thousands of Symbian applications, MP3/video player, FM Radio, Email, Opera 8 browser, handwriting recognition and 3G UMTS support. The P990 is posh but not overpriced. This phone is made for industry leading professionals who need every tool and best communication capability regardless of the price tag.