Someone ported or swapped my number
This is the attack we take most seriously, because your number is how I know you. The defenses stack: lockdown works from any phone, the recovery phrase gates erasure and export even for someone holding your number, and money always confirms. If you suspect a swap, lockdown first from any phone, then call your carrier — in that order.
A number that's been silent a long time, or that shows signs of having changed hands, gets a gentle confirm-it's-you before anything identity-level — numbers get recycled, and the person answering may not be the member anymore.
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Didn't answer it? Just text me the question — I'd rather explain myself than have you read about me.