Dual SIM cards

I read somewhere that the OS for iPhone supports dual SIM cards.
After a quick search i found a (french?) website that sold adapters that could fit two SIM cards in the slot of the iPhone.
They claim that they havn't fully tested this on the iPhone 3G and 3Gs.
Fitting the SIM cards in the adapter requires cutting them down in size and cutting a hole in the SIM holder for the iPhone.
As for the cutting of the SIM cards, one can always buy a replacement, but if this damage the inside of the iPhone, I don't know how to deal with this...
Does anyone have tried this, and have som input?
Is it recomended or not?

I'm not sure how they could do this with only one SIM card making contact with the internal connections at any one time. No amount of on screen menu would activate a SIM card that isn't physically making a connection to the internal connections.
They would have to make some sort of adapter which connected both SIM card to a common contact port which lined up with the internal SIM connections within iPhone. Amending the software to have an option to switch SIM goes against the OS Terms and Conditions. Unless the application is authorised by Apple and is available through the App Store, any damage caused as a result of trying this would render your warranty VOID.
I would not recommend trying this, but it is your iPhone and it is your decision (and money)

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