If I was to use a phone's data connection to access a website, and then pop that sim card into another phone to access the same website, could the website tell that I am the same user?


1 Answer 1


Not that I am aware of.

  • Websites receive the information the web browser provide
  • The web browser of the phone devices is an app that has not the permission to get the SIM data of the mobile device (unless it was an malicious app)
  • Information of the device apart from cookies does include the User Agent, but that string of information that not include that kind of information.
  • You can not relay on IP addresses, your phone provider may use DHCP/nat and the phone could use a different phone provider network (roaming)

I would suggest using client side certificates, when the phone is changed remove the certificate and when user is no longer trusted revoke it.

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .