Someone tracks my calls & SMS - How?

I have accidentally found that someone can track the calls & SMS made through my mobile. My network provider claims that it cannot access such information; only the police can do so.

How can that “someone” know all my calls & SMS? Only serious answers please, as the matter is critical.

Thanks

Well its possible, unlikely but possible, Checked the phone for extra chips?

This is an old thread but:-

On older phones bluetooth had HUGE flaws which would allow full remote access. To name just one of many google - malformed OBEX communication objects. This is normally linked with a form of bluetooth DOS (done by children) on Nokia's but can be used to gain remote access if they know how. Almost all tech docs never made a POC public so you need to write the tools yourself. This stopped a lot of children from doing it. Todays phones arnt effected but there are others.

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