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Much the same situation here. I've only had (mostly) reliable voice reception for a year or two, although text messages have been getting through a bit longer. But I will note that with Google Authenticator / Authy style authentication (as opposed to the more common and vulnerable SMS style), once it is set up (which I did through WiFi to my local network) you don't need an active connection. One of my backup devices for Authy is an old smartphone that has no SIM in it at all.
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