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Not only is it annoying, but it can interfere with a network correction source. Luckily there is a simple solution:
1. Click at the top of the screen, and then click on the icon that looks like a cell phone.
2. Next click on the “Wireless Manger” link (blue)
3. Click on Menu > Wifi Settings
4. Click on Menu > Advanced
5. Uncheck the “Turn on available network notification” option > OK