Unless you are watching movies on U-tube, dowloading mp3's, or just plain download a lot of stuff they probably will not not. The have that unlimited plant but its not unlimited. They have terminated peoples accounts for downloading too much & using up bandwidth. You should be fine if you are just checking emails & casual web browsing.
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Their unlimited data plan does mean it unlimited. If you are routinely frequenting site that don't have a mobile version web page they can look at that too. From that make the determination you are tethering.
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