T-Mobile Blocking Tether

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http://forum.xda-developers.com – I have CM10 latest nightly installed on my T989, and for as long as I remember have used wireless tethering to share my internet with various devices (ipad, surface, touchpad, etc.). Today, I started up the wireless tether on my phone, jumped on my surface and started getting redirected to a T-Mobile splash page advertising Mobile Hotspots. Is this something new? Anyone else experiencing this? I didn't think they could detect a rooted phone using tether... (HowTos)