For some purposes i thought it would be very nice to enable some telecommunication abilities on raspberry pi. For example if something does not work as it should (e.g. average load too high, temperature/humidity too high) raspberry pi can call you. Or if you just want to control something quickly via phone (e.g. starting a process, reboot or open the door) – raspberry pi can answer your calls and made it for you. Of course you can make it via SMS or web-interface, too – but for example a call often gets more attention than a sms.