SIM cards are in most cases limited to 32kb in size so it would be tricky to store a virus on it.
You can get bigger capacity but even then it’s small.
Ultimately people don’t often stick new SIM cards into a device so it’s probably not worth the hassle of programming a virus that works via sim when you could just email it etc.
I dare say that technically it’s possible but if someone wanted to get a virus onto my phone I suspect I would notice them removing the sim tray.
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