Bob is going to Iceland and Finland and wants to know where he can get prepaid wireless SIM cards. Leo says to check out Prepaidwithdata.wikia.com. You'll be able to find out which SIM to get for your phone in the country you're visiting. The phone needs to be unlocked, but as long as you're in good standing with your carrier, they should be willing to unlock your phone for you. Many carriers like T-Mobile are starting to offer international data roaming for free at speeds as fast as LTE. The International Data Roaming Plans are much better now but check with your carrier first before deciding between roaming or purchasing a prepaid SIM.