Perfect advice reznor9.
i got my Universal Sim today in the UK from
gsmalleyway@yahoo.co.uk. These guys are great. Paid yesterday by paypal and received it today! Everything works as promised...except I haven't been able to test 3G & Internet as yet due to poor reception in the countryside.
I did as you did and applied a bit of tape at the bottom...went in no hassle...went to pull it out but the chip on the Sim unlocker got stuck and had to take the phone screen out to get it (2 screws by the speakers and a stanley knife..yikes!!

). Finally got everything out without damaging anything, but I decided to use thin salletape to effectively make 1 simcard out of the original and the unlocker (ensuring that the 'chip' was also covered by tape, so it couldn't rare its ugly head again and get caught whilst trying to remove the sim).
This works a treat as I can now remove my simtray with everything in it, without causing any damage, but it is still an awkward job as the sim tray doesn't just pop out as it should with just a standard sim in it. Instead it is slowly eased to protrude just above the top of the phone's casing, allowing me to pinch/grab it then gently pull it out.
I'm pleased with this for a temporary solution, but am looking forward to the software unlock if it ever graces the web.
Final verdict? Not for the feint of heart, but well worth to be able to use your 3G iPhone as intended...NOW..as opposed to....who knows when the software unlock will come?