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I was browsing internet from my mobile, and I noticed that mobile site were showing ads specific to the mobile operator that I was using. I switched the sim card of a different mobile operator and browse the same sites again and now this time they were showing ads specific to latter mobile operator.

so how does a site get to know which mobile operator I'm using ?

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If you are browsing using your operator's network (and not Wi-Fi) they could just check which company owns the IP address that you are assigned when accessing the site. It's pretty easy to do.

Click on this to get information about the IP address you are using. As you can see it tells you which company actually uses the IP address in the host section.

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