Support HELP with tethering.

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http://androidforums.com – It seems whenever I turn on the portable hotspot/WiFi on my phone my 3g data green bars instantly turn gray. So I will start with full green data 3g then turn on tethering hotspot to connect with my nexus 7 and it turns to full gray bars. I am running jelly bean. Please let me know if there is something I can do. (General)