If you do get a mobile phone, make sure you get the so called 'bar' removed from it. You have to ring up and ask to get it de-barred. So that you can use it in different countires. Otherwise, when your travelling from one country to another, you just won't be able to use it.
Personally, I'd get a phone card. Each country has different ones. I use them when I go abroad in Eurpoe. Much cheaper.