Currently Being ModeratedMay 24, 2013 2:04 PM (in response to Ali saddam)
Thank you for posting in the Apple Support Communities. I found a couple of resources to help with your weak Wi-Fi signal on your iPhone. You can skip any steps that you have taken or any steps that are not relevant to the issue your iPhone is having:
In the second article I listed above, I would follow the steps under the sections titled "After joining a Wi-Fi network, you notice the signal strength is weak or fluctuates" and "If you are unable to access the Internet while connected to a Wi-Fi network." I hope this helps!