Sim Card - Can I use it in another phone?

I just upgraded from a 3G to a 4 and everything is working. I was wondering if I can pop the sim card out of the 4 and put it into the 3g and have the 3g work? Basically, I am thinking if I go to a place I may lose or damage the phone (today I will be timing a swim meet), I would put the sim into the 3G. If anything happened to the phone, no big loss. When I got home, I would put the sim back into the 4 and be back to that phone.

You can also get a hand punch on flea-Bay to punch/convert a regular SIM card down to micro SIM size for the iPhone 4. The resulting micro-SIM can be restored to full size with the converter card noted above.
I easily swop micro cards into my 3G phone this way.
DM

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