I recently came across a tool for international travellers that is absolutely awesome. The product is called MaxRoam (www.maxroam.com). It essentially lets you roam with an unlocked GSM cell phone, while giving you the ability to add up to 50 local numbers. That way people in each place you roam have a local number to call!

The pricing is reasonable too. If you are a frequent traveller overseas, I encourage you to check out this cool product!