What is 32k sim

What is the Difference between 32k and 64k SIM .Also how to distinguish between 2G,3G and 4G SIM cards
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  1. I use a 64k sim card which allows storage for up to 500 contacts and i forgot how many more sms messages. i don't know if it would be the same on your 32k sim, but you can try checking this anyway.
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