There is going to be an estimated 600 Million Mobile Internet users in 2004, according to estimates, and this emerging market is now starting to take off.
Tutorial Details:
All different parts of the software and Internet industry is moving in to this space, and I've seen a huge increase in interest over the last 12 months. The recent JavaOne conference in San Francisco also showed this trend, and I believe that wireless is a major opportunity for Java to make it big.
This is the classical set-up with one device that acts as the modem and one as the terminal equipment. The application resides solely on the terminal (MC218, Palm V, Laptop etc), which can be used with or without wireless access. The terminal is connected to the modem via IR, serial cable or the emerging Bluetooth radio technology. The modem is then acting purely as an intermediate communications device. One setup could be the Ericsson R520 GPRS phone talking to a Bluetooth device.
Pro's:
If you want to upgrade one of the devices, you don't have to upgrade it all
Sometimes you want to just have a phone with you and not a PDA or an mp3 player (or whatever is in the integrated device)
The phone with data capabilities can be used together with a laptop OR a PDA OR whatever device I want to use that day
Cons:
It might appear more complicated to configure two or more devices than one that is shipped integrated
Unless you use Bluetooth, the use of cables might get messy
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