First of all, I apologise if this thread is annoying but.. - I've done some homework how to cut it. Those guide are not so clear in deep detail, i.e. caution, what type of SIM or connectors, etc - I already wasted TWO SIM which I thought they have been trimmed properly in size (but incorrect connection) - I have ONLY one SIM now in my iPhone 3GS and I can't destroy it again. My wish is that I wanna tryy my last chance to cut this last SIM and it works on my new iPhone 4 OK I found that SIMs have different types of connectors (not sure what kind of those bloody classification). Here please have a look The O2 normal SIM on the right is my wife's SIM and I won'y do anything with her beloved SIM (She owns 3GS phone). On the left hand side, it's my target to be cut properly A couple of micro SIM were alr cut and iPhone 4 did not detect anything, which kept saying 'No SIM card inserted'