Just a quick note to mention that MAXRoam.com is a really great service. Essentially it’s a reduced rate pre-paid SIM card that lets you add multiple numbers to the same SIM. For example, I now have a SIM card with four international numbers in Spain, Poland, Germany, and the US and they all work seamlessly in almost any phone. It basically lets locals call you at local rates and you call at almost local rates when in country.