How to stop phone tethering

We gave internet access to some users in a company and they are providing other staff members (who are not permitted to use the internet) by tethering function on their phones.
If possible we would like to know if there is a solution for this.

Thank you
Roy_HachacheAsked:
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ola_erikCommented:
It would help if u included what phones u talk about and how these phones connect to Internet.
Roy_HachacheAuthor Commented:
Only Android - Like Samsung - LG - HTC. They are connected to the internet using access points.

PS. they can gain access after we add their mac address to the system
David Johnson, CD, MVPOwnerCommented:
This is a HR problem and not a technical problem unless you want to not allow these devices to access the internet using your WIFI
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gheistCommented:
Since the phones are owned by people they are completely eligible to enable tethering, data syphoning and password stealing.
If you buy phone for people you can use "android for work" to configure devices, or make your own AOSP without any tethering support (one way expensive, other way time consuming)
Roy_HachacheAuthor Commented:
but can i know at least who activated the tethering to warn him or block him.
kenfcampCommented:
If you gave them network access and they're using their phones to share that access with unauthorized people, then the only recourse (IMO) is to remove their access.
gheistCommented:
Your HR is paranoid. Just tell them to buzz off... You cannot detect tethering activated remotely.
Roy_HachacheAuthor Commented:
OK. so there is no way to block internet access to tethered devices !!!!!!!
gheistCommented:
Just disable internet access for those caught red handed (for 1 month to not make it too much paperwork)

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Roy_HachacheAuthor Commented:
Thank you all
David Johnson, CD, MVPOwnerCommented:
As I originally stated this is a human resources problem.  Employees sign many agreements and somewhere in this paperwork should be the 'don't share your internet connection' and the ramifications of doing so.  This covers your technical butt when you catch someone doing it and you have something to fall back on that can't be countermanded by their manager going to your manager and complaining.

If something is not written down it never happened.
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