Switching Sim Back And Forth? Does it Wipe Phone Clean?

I bought a used iPhone 3G from Craigslist for my best friend as a gift. I have an iPhone 4 and would like to check out the 3G and make sure it works before I give it to her. Can I pull the SIM card out of my iPhone 4, pop it in the 3G, and then pop it back into my iPhone 4 without losing all my settings on the iPhone 4? Or do you have to wipe the phone clean every time you stick in a new SIM card? I want to check out the 3G but I don't want to lose everything on my iPhone 4.

The iPhone 4 uses a micro-SIM card and the 3G doesn't, so unless you have a SIM card adaptor for the micro-SIM card to be used with the 3G, this won't work and you will need to temporarily activate the 3G with your line/number.
Removing and re-inserting the SIM card does not touch or wipe any data on the iPhone. The only way to do that is by using the erase all content and settings option on the iPhone, or by restoring the iPhone with iTunes as a new iPhone or not from the iPhone's backup.

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