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This gave me a chance to play with a gadget I got on eBay a couple of months back. You plug a SIM card in one side, and the other side plugs into a USB port, and its software allows you to transfer numbers between the SIM and the computer. So I was able to transfer all the numbers to the computer, sort them, remove duplicates, remove old contacts and copy them back to both SIMs.
And it has a feature to add international codes to all numbers, which comes in handy when you're roaming.
Neat.