There are a lot of protocols in a phone. There is 3G, WiFi, text messages, phone calls and more. When you're out and about your 3G turns on, when it turns on you get signals through the air wave and you can go on the internet but when you're indoors its totally different, if you have an internet connection at home you connect to your WiFi, when you're connected you can go on the internet.
Another good protocol is bluetooth, when you are with your friends and you're listening to a song that your friend likes, you can do a quick and easy transfer from phone to phone. All you have to do is turn your bluetooth on and connect to your friends phone, click on the song and send via bluetooth
www: you have clearly identified the protocols used by mobile communication devices, giving examples of their use. P3 achieved.
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