Can I use my mobile phone overseas?

Yes it is possible to use your current mobile phone while overseas, however it can prove very expensive unless you plan ahead. If you were to simply use your current SIM card  and activate  global roaming, call rates will be in of excess of $5 per minute to call back home. The cheapest option is to purchase a TravelSIM before leaving, that enables you to use your existing phone to call home, with call rates significantly cheaper (up to 75%) then using you mobile providers SIM card.