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No sim or invalid error lumia 640xl lte

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Windows Central Question

I've tried everything to get phone to recognise sim, i've tried 5 different sim cards, rebooted, hard reset several times and still not recognising sim


Dec 5, 2014
This happened to my 640, and I could not find anything that might make it not recognize the card. One thing I didn't try is cleaning the contacts.

I'll see if I can try that, and report back. You may be able to put a little rubbing alcohol on a Kleenex, and gently clean them.

I ended up retiring the 640 due to this issue.