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In all seriousness... I've been getting several SMS messages from unknown numbers every day, as well as several 0:02 second empty voicemails every day. I've had my phone number for 17 years, and it's tied to so many things that I don't want to change it. I'm a pretty low value target for someone to be stalking my location with such a sophisticated method. Should I be worried that this is more than just spam?

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Just change it.

There are too many (bad) websites that have my number for 2FA, plus my lifelong network of contacts all have that number.

Consider porting the number to something like Google voice or jmp.chat and get a random number you don't care about for your SIM.

It seems that Google Voice numbers can't be used for some 2FA services.

That's possible, but those services most likely offer another form of 2FA. Getting away from using SMS 2FA everywhere you can is best.

I know, but it's not always under my control.

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