Yep, this is me. Bought 1 yr vodafone prepaid, after getting reminded to enable VoLTE on my phone (a 2019 model), which I did. But, the phone doesn’t actually do VoLTE calls, so come Vodafone’s 3g shutdown weeks later I suddenly could no longer make or receive ANY phone calls. Internet/data works fine.

Ended up getting a cheap new phone just so I can make phone calls in an emergency.