I've figured this all out now. There was a 12-hour period after I attempted to activate my device on Verizon using "Activate or switch devices" that Verizon recognized my new device but didn't activa...
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I've figured this all out now. There was a 12-hour period after I attempted to activate my device on Verizon using "Activate or switch devices" that Verizon recognized my new device but didn't activate/assign to my phone number. During that period, I received two voicemail messages in the form of garbled texts. Those messages came immediately upon successful activation, and I deleted them because they weren't readable/usable. I actually deleted my own voicemails (texts), it seems, without realizing that's what I was doing. I then blocked Verizon Premium Visual Voicemail for two reasons: 1) I don't want visual voicemail; and 2) it isn't even possible to get Verizon Visual Voicemail on my device (it's grayed out, cannot be installed, device not compatible—even though Verizon sells this same device. I can, however, use VVM with a third-party app that retrieves VVM messages with no problem; it can't retrieve the ones I manually deleted when I didn't know they were VVM messages. That was a long-winded way to say it's resolved, but in case anyone else encounters this, I wanted to give details of why it happened and what to do/not do (don't delete garbled texts! lol) if faced with this.