Wi-fi Iphone 4 8GB

Hello, i  have a problem with my iphone 4 8GB. After the update, my signal is very weak. Please Help me...i have signal only beside of the router :-(

Did you do all of the troubleshooting steps, including shutting down the router?  If so, when you shutdown the router you have to disconnect the power so it is actually shutdown and not in standby mode.  Keep it powered down for 5-10 minutes, and then power up.  Give it a minute or two to stabilize and capture a new starting IP address, and then one at a time power up each device you network.  Giving each a chance to capture its IP address before going on to the next device.
Does the iPhone show a weak signal on other wireless networks, such as at a coffee house?
If all of this does not help, then it might be a good idea to visit an Apple store genius bar and have the techs test the iPhone to see what is wrong.

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