Was about to say, they are probably using TTL to detect it 🤣🤣, such a simple (and mist say genius way) but also easy to fudge with a little mangle rule :-)
Many mobile carriers restrict personal hotspot usage, forcing users to upgrade to pricier plans just to share their internet connection. For example operators in Panama offer unlimited data ("Ilimitado"), but that does not include hotspot traffic.
You can adjust TTL settings on the connected device or use SOCKS proxy to make your hotspotted traffic look indistinguishable from traffic originating from your phone.
https://juraj.bednar.io/en/blog-en/2025/03/07/bypassing-hotspot-restrictions-for-data/
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