My friends call history is tracked

I hope I'm on the right sub. I know nothing about hacking so I really need some idea on this please.

My friends bf is able to track my friends call history and duration while being in different location.

How is this possible?

Country is India incase that helps

Thank you

submitted by /u/lIIbehere4you
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from hacking: security in practice https://ift.tt/Wr9nEA8