PCS Phone + UP.Browser == Killer App?

gkostolny asks: "So I've had a Sprint PCS phone for about a year, and I finally decided to upgrade. I ran across a new Samsung SCH-3500 for $119 at Fry's and jumped on it. After waiting very impatiently for a day and a half, the 'Wireless Web' capability was activated, and I've been going crazy with it. You can access pages written in HDML and WML on the phone, and the default menus include yahoo, mapquest and infospace. This afternoon, I was able to go into the Yellow Pages, punch in the name 'Computer Literacy' (a local bookseller) and my zip code, and it came back with the number. I selected 'call', and was connected and able to ask if they had a book on WAP in stock. My question is, has anyone else played with these phones much, and if so, what do you think? Is implementing sites and various online capabilities for them worthwhile? Will wireless be the next big wave? (And are there any good reference books on this stuff?)"