Wirelessly posted (iPhone 3G: Mozilla/5.0 (iPhone; U; CPU iPhone OS 2_2 like Mac OS X; en-us) AppleWebKit/525.18.1 (KHTML, like Gecko) Version/3.1.1 Mobile/5G77 Safari/525.20)
Considering bringing an older unlocked phone if you have one so you can buy a SIM.
Or add the Fring app to your iPhone and use a Skype or another VOIP account.