I've never understood how this can be limited in practice: surely as far as the carrier is concerned, all traffic from the mobile device is the same (unless there are identifiers on the traffic coming from hotspotted devices via the mobile device). Here in Australia we've never had any form of hotspot detection/segmentation - if you have a data plan, all data features work (across all carriers). I do recall lots of online chatter from the US though, especially years back when mobile data was more of a precious resource.

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Centigonal 15 minutes ago | parent | next [-]

On android, there is an OS-level feature that checks the cell tower to verify if you're allowed to create a hotspot. It runs whenever you try to enable the hotspot feature. On rooted systems, you can disable this check. There are also apps that let you run a hotspot without using the OS feature, bypassing the check.

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HnUser12 25 minutes ago | parent | prev | next [-]

I recently switched to a carrier (Fido/Rogers in Canada). My plan limits hotspot by disabling the hotspot settings on ios. However, I was able to enable it again by changing the access point name.

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ezfe an hour ago | parent | prev | next [-]

Your phone voluntarily tags the hotspot data with specific TTL values which carriers use to segment the data. Not all carriers work the same though.

	▲	rkagerer 11 minutes ago \| parent \| next [-]
		Different applications on a single device can't apply different TTL's? I thought TTL was a pretty basic knob exposed to applications. e.g. A sensor that transmits fresh data every 20 seconds doesn't need stale packets bounding around clogging up the pipes, while a file transfer over an intermittently delayed link might benefit from a higher TTL.
	▲	eptcyka 11 minutes ago \| parent \| prev \| next [-]
		Voluntarily tags specific TTL values much like your home router does. Some providers assign a different IP to hotspot users.
	▲	jamiek88 11 minutes ago \| parent \| prev [-]
		Super easy to spoof too.

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drtz an hour ago | parent | prev [-]

> surely as far as the carrier is concerned, all traffic from the mobile device is the same

Going on a bit of a tangent, but deep packet inspection can identify packets routed using NAT, so if the phone is operating as a typical hotspot it would be identifiable by your carrier. Carriers in the USA used to block / denylist / charge extra for tethering using this exact approach.

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HDBaseT an hour ago | parent [-]

Deep Packet Inspection presumably requires a certificate to be installed on my device to allow my connection to be MiTM'd.

	▲	codebje 42 minutes ago \| parent \| next [-]
		DPI can refer to inspecting beyond just the headers, but since it's more of a marketing term than a technical one, you could also say you're "deeply inspecting" the IP headers of a packet and no-one would show up to arrest you for bad terminology. Anyway, one way to detect NAT is to observe different TTLs originating from one device. Is that deep inspection? Probably depends on who you ask. The fact that you have to track information across multiple packets counts for something, though. Off the top of my head I wouldn't really expect there to be much value in a MITM inspection of the contents of HTTP traffic for the purposes of NAT detection. You could probably come up with some scenarios in which it might be possible, but I'd content those scenarios aren't very practical. Easier to compare TTLs between packets, say, or track connections to known OS "phone home" destinations. While these just use information from the IP layer, they're stateful observations requiring comparisons across multiple packets, and that might count for something. One way to detect a shitty carrier service, though, is that they're inspecting your traffic for "good" or "bad" uses of their service, because that is a good indicator that they're not just a carrier. I call it Dickish Practices Identification, or DPI.
	▲	akerl_ 42 minutes ago \| parent \| prev \| next [-]
		DPI is distinct from TLS MITM (though many enterprise devices offer both). The delineation here is between "shallow" packet inspection (which basically nobody refers to because it's just a normal part of networking), where network devices look at just the bits of the packets they need to route / NAT / etc them appropriately. DPI can tell a ton of things without needing to MITM encrypted layer 7 traffic. A boring example is that you can tell TLS from OpenSSH traffic just by seeing the initial handshake. sslh ( https://github.com/yrutschle/sslh ) takes advantage of this on the server side to let you run both on the same port. A less boring example is identifying OpenVPN, Wireguard, etc traffic regardless of what port they're run on, to enable blocking VPN traffic on a network.
	▲	ninjaoxygen 32 minutes ago \| parent \| prev [-]
		At one point it was definitely not so deep... carriers were literally looking at the IP TTL and seeing whether it was a recognised value from the phone or a few hops less than one of the common defaults, in which case it was considered tethering traffic. You could spoof it by finding out your mobile's TTL, overriding the TTL in the connecting device to be one higher than the mobile.