Yes, the idea is to bulk up the SIM card. I'm not exactly a precise person so when I did it just cut a little sliver of Scotch tape that more or less lined up with the size of the card. I reckon as long as it doesn't wrap around and cover the metal contacts, you should be OK.
Since I did it, I have had zero SIM error notifications.
Thanks for the details. I haven't had the error for a few days now, but if/when it comes back I'll try the tape.
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