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Thanks for this. Much appreciated. Are you able to recommend one to buy?
https://forums.macrumors.com/thread...-3.2378051/page-3?post=31904733#post-31904733 includes my recommendations.

I'm a big fan of the Yubico Yubikey 5C nano for laptops/desktops And the 5Ci for mobile devices. Others have recommended the 5 NFC so that you don't need to use the physical lightning port. I don't have experience with the NFC version, as where I work we're not allowed to use NFC due to our security requirements (this isn't common, so don't take this as consumers shouldn't use NFC), but I'd encourage you to see if that would work well for you as it should be more convenient.

Glad you found the explanation useful and hope this helps. Best of luck, hope you have a wonderful day and let me know if you have any questions
 
but now the buttons must be released in order to place the call.

So, now it's like a grenade? How does that prevent an emergency call from being made? You can't hold the buttons forever...
 
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