Thanks for your post and apologies to hear you've been having an issue with TV Anywhere not working on your S7 Edge device.
We've released an update today and checking on my S7 device - things are working.
Can you try updating the TV Anywhere app and letting me know how you get on.
P.S - Welcome to the Community
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Thanks for coming back and letting me know things are working for you now
Currently there aren't any plans for TV Anywhere to work with 3G however as soon as we, I'll let you know