Just got a highly suspicious phone call to my old cell phone from a number coming up as 0000000000. Claimed some account of mine was locked, though I didn’t catch what company it was claiming. Told me to press 1 to get to their security center. Since I cannot think of a single legitimate company I would have an account with that would still be connected to my old phone, and given my paranoia* about these things anyway, naturally I hung up.
Also, no legit place would be calling at 6 in the morning, AFAIK. Even most diurnals would be pissed being woken up at a time like that.
* = I once said “I don’t give credit card numbers out over the phone” to someone and they had to remind me that *I* had called *them*.