A modern cellphone must of course include a cellular radio transmitter and receiver. But many feature-phones and smartphones contain other kinds of radio. A basic GSM phone such as the Nokia 3120 contains a cellular transceiver capable of operating on multiple frequency bands, three in this case: 850MHz, 1800MHz and 1900MHz. For maximum connectivity around [more...]
There are three main technologies you can use to connect a laptop or webtop to the internet: WiFi, WiMax and Cellular radio. A satellite connection is also technically possible but is likely to be expensive and impractical. A WiFi connection can use the home WiFi connection from your wireless router. Away from home you will [more...]
The biggest difference between the original iPhone and the iPhone 3G is that the iPhone 3G supports third generation phone networks, which can transfer data much faster. The fastest data transfer supported is 3.6Mbit/s HSDPA which, although not the maximum that HSDPA can support, is fast for mobile web browsing. 3G is supported on the [more...]