The cost of renting a mobile hotspot may be less than buying an international data package from your network provider.

BBC: Rentable wi-fi for overseas travel

As long as your carrier officially supports tethering, all you need is the Nexaira BC2 and international power adapter (sold separately) and you are ready to tether your iPhone and create a hotspot. 3Gstore.com ships to over 200 countries worldwide via FedEx.

ENGADGET: Nexaria BC2 router supports iPhone tethering for some reason (video)