5 Great phonesandyman233 | 12/05/2007 | See all sandyman233's reviews (53)Teh w810i is one of the most advanced phones with alot of features that are not avalible on other phones. This phone has expandable memory as well as a inbuilt memory. I takes Memory stick pro duo memory cards. i recoment putting 1Gig in it at the most beucase anything over that has been known to slow the phone down and make it crash and often even stop it from working atall. 1 Gig should be ample for the walkman and to store videos, pictures and themes on. This is one of the most reliable phones i have ever had. It also has a good battery life which is very important.Bluetooth is easy to use and very user friendly on this phone. If you are looking to buy a phone, look no further!