We need to use a global smartphone if we want to travel to other countries and use our own mobile phone. This is because a global smartphone is a quadband mobile phone that runs on GSM 900, GSM 1800, GSM 1900 and GSM 850.
It would be really useful as you can use this phone in any countries even if you live in UK or any European countries. Receive calls or texts even if you are in Asian countries. There is no need to change your mobile phone when you are travelling to different countries if you have a global smartphone or also known as quadband smartphone