What you are doing with your home and cell phones while you are traveling overseas? Most probably you’ll leave both at home, since landline is not quite portable and mobile roaming charges are not low.
Using SkyQube device you can now forward both your landline/cell to an overseas number. Just take out the SIM from your mobile phone and put it into the device or plug the PSTN landline, install the software on a computer and automatically transfer the calls to another phone number. Your friends that are calling you home or on the cell will not even notice that they are forwarded overseas.