For few days I've been getting 1 private call at around 6 in the morning?

I never had private calls before until my ex started calling from them but not spoken to him in weeks and I've now blocked all private calls. I'm getting nervous that this is him going to stalk me again. I'm only guessing it's him because it would be between 5 and 6 in the morning he'd message me.

should I take it off unblock to see if it's him?

For few days I've been getting 1 private call at around 6 in the morning?
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