First you will need to call Orange to ensure that your phone is enabled for international roaming. You can also check the cost of the call on their website, but it will be more expensive than buying a phone card there and using that.

luci

Also need to make sure that if you take your phone it is Triband - to connect to the local network.

My wife and I both have Orange pay as you go but neither phone is triband. So we didn't bother to take them with us. My eldest lads phone was triband and he took his. We used it for the occasional text but in fact he found it cheaper to buy a phone card from the hotel reception and to phone his girlfriend on one of the lobby phones. 6 cents (3p) per minute.