Ways to spy a mobile phone.?

is there any other way to spy on someones phone if he has the bluetooth off and you don’t know the phone number?? i recently changed my phone number due to some troubles i had with some stalker like that and i need to know how i can protect myself, switching my mobile off and taking the battery off of my my phone is not an option and don’t tell me to call the police because it involves a family member.

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