Coming from an Australian start-up, Strone is designed to save on the roaming costs while travelling. This is a small device that connects to the Internet. Whenever you are travelling abroad, just insert your local SIM in this device. This device is capable of forwarding all the calls automatically to any Internet-connected mobile device anywhere in the world. A single call will consume minutes from the Strone plan which starts for as low as $10 per month for up to 150 minutes of calls.