802.20 vs WiMax vs 3G

With the vision that the next generation mobile handheld device will enable the user to access high speed data service, naturally one may ask: which wireless technology? Is it 3G/4G from cellular telecoms, or WiMax(802.16, wireless MAN), or 802.20? Given the huge number of mobile phones shipped every year, the business perspective to put the technology on each phone is indeed enormous. Clearly the telecoms cannot afford to lose this battle......

Cell Phone Bluetooth Security

Put it in this way: if the cell phone is in visible mode, it will be discovered by the malicious hacker and then, after some "....", the hacker will be able to see address book or even place a bug into the phone so you have another big brother.

My question is, what is that "...."? How does the Bluetooth "gun" get into the symbian system? Similar question to the latest Windows Pocket PC trojan: how can they do that? Is it the same stuff as hacking into a desktop computer system?

What is a Smartphone?

A story by a Palm Treo user talked about the definition of "Smartphone" made by two MS employees. Basically two things:
1) a smartphone offers offline access to built-in PDA functions;
2) a smartphone must be sync-able with desktop/laptop computers.

The story also mentioned that carriers see per-user revenue of smartphones is higher than regular cell phones. Why? Check out their device price list and the monthly charge of data service.......

The 2nd part of the story compares MS smartphne with Treo, with emphasis on the features MS smartphone provides but Treo lacks of. For example, customized home screen, speaker volume adapting to calendar, etc. However, the author claimed that MS smartphone in general, in this case Motorola mpx 200, is very slow in terms of application response time, and thus the Smartphone OS felt immature.