I am still using my FFXI one from when they were introduced pre-FFXIV. I've got my 1.0 one if I need another.
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I am using the one from ~2006 FFXI. Still works.
I have a backup on my shelf, bought earlier this year.
The XI one is still truckin'. When the day comes that it throws a warning, I'll probably remove it without a replacement since I'm not trusting my ability to log in to a phone app that could be lost with the phone.
got mine when i started arr just replaced it with a new one the old one was giving me a battery warning so out with the old in with the new not too hard to do just go to the moogle store and access your account and go to the area with the key fobs and buy a new one when you get it or have a back deregister your old one and register your new one and your set to go.