You may have seen videos such as this one, where a group of people at a party put their phones on the table around some corn kernels. They call the phones, and when the phones start ringing, the popcorn pops. Does this really happen? Wouldn’t the phone be doing the same to our brains when [more...]
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...]
Bluetooth is a versatile wireless standard which allows electronic devices to exchange data with other nearby devices. For two Bluetooth devices to work together, it’s not enough that they both contain a Bluetooth chip and antenna. They must also support the same Bluetooth profile, which defines how the data exchange takes place. The iPhone 3G [more...]