Good to know! T-Mobile/Telekom in Slovakia has good pricing on international data roaming — 15 Euros for 500 MB in most countries (countries like Afghanistan cost 30 Euros per 500 MB). So while in the US- I am using my Slovak SIM card and I am constantly on the data roaming plan. Also calls within EU are cheap (e.g. for free within 120 minutes of my plan, unlimited to T-Mobile). I pay 20 Euro / month for that.