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Several days ago I clicked on an advertisement in chrome in my android device (MIUI 8). It redirected to a site for mobile service subscription and my number was subscribed instantly. I didn't do anything other than going back to original site. How did the site get my mobile number? I don't think it is possible to get that from my google account.

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  • Did they display your phone number, or did you find out afterwards in your bill? However, worth a look: WAP Billing is what I think might be behind it. Very popular for "abo traps" when "clicking" (or "being clicked without your consent") on ad banners – exactly as you describe what happened to you. – Izzy Jun 12 '17 at 10:18
  • @Firelord I tried watching the HTTP headers and mobile no was not there. – lnman Jun 12 '17 at 13:11
  • @Izzy no it didn't display phone number. I got message that my number was subscribed. – lnman Jun 12 '17 at 13:14
  • That very much sounds like WAP billing. Depending on the country you live in, you can have your provider "disabling" WAP billing (e.g. in Germany, law makes them oblige corresponding user requests). Still, what got subscribed before stays, so you'd need to cancel such subscriptions explicitly – not with your mobile provider, but with the corresponding content provider. As for the "how thy got it in the first place": that's in the vicinity of your mobile provider, who can map the IP presented to the mobile number behind it. Also see the Wikipedia article I've linked above. – Izzy Jun 12 '17 at 14:41

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