USing two different SIM cards (different operators) with Iphone 4

What happens when I first sync my Iphone 4with Itunes?
The reason I ask is that I plan to first use it with a Swisscom card and thereafter with an other operator (other SIM card too) in Asia.
Anything I need to know or do differently? Any problem when I change the SIM card ?
Thanks.
English; Français oder Deutsch OK

I am always switching SIM in my unlocked 3GS iPhone, mainly in Switzerland, other European and Asian locations. Never had any problems with email, SMS and calls. Admittedly, I only sync with the Swiss SIM card installed. Most of the carrier settings are loaded on the SIM (or captured automatically) once the SIM is activated in its home country. Good luck!

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www.engadget.com
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USing two different SIM cards (different operators) with Iphone 4

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