No. This has been discussed many times throughout many forums. Since we do not know what detection method is used we cannot say how to avoid it.
I received the letter warning me about tethering after I watched amazon prime streaming on my device for a few weeks. The increase in data to a website that is designed to work with pcs and not phones is probably what triggered it. I stopped watching prime from my phone but kept tethering and I have received no further warnings.
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