Thought this might be of use to people here, especially if you hate having to switch sim cards out when travelling:

http://www.magic-sim.com/

The 28th gen no cut model is of most attraction as you don't have to mess around cutting up sim cards.

Its got a lot of positive reviews on the XDA forums, especially for the Samsung Galaxy S2.

I personally have not bought one yet, but intend to do so in the near future.