The use of mobile phone is no longer limited to communication only. Nowadays, mobile phones are equipped with a variety of features which enable these phones to use as cameras, music players, organizers etc. Of late, there has been significant increase in the demand of unlocked phones.
The operating frequencies of different countries vary and thus, a cell phone working in US might not work in Russia or vice versa. Thus, it is better to have an unlocked phone. If you are a frequent traveler then make sure you are having a mobile that works universally and is not country specific.
