But when I use the same data sim in my phone then I can't do tethering.
I TAKE IT SIMPLY AS THE CROOKEDNESS OF THE CARRIERS. Otherwise I don't see any difference between using the sim in mobile router or phone.
I'm guessing there's like a signalling between the carrier(3) and your phone, "Tethering, Y or N?" That's based on the above information. The mobile router is purely a data device, and all it can do is have other devices connecting to it, and so there's no need to signal is tethering allowed or not. That's just a guess based on what I know.
Not sure if it's really about carriers been crooks or not, because this whole business of paying for tethering only seems to affect unlimited data plans. With metered and limited data plans, you pay for say 3GB, they don't care how you use it, you want more you have to pay for it. With unlimited, they might working on the assumption that if you're using a computer you could be torrenting hundreds of gigabytes of movies or something. Something you're much less likely to be doing on a phone.
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