I found an interesting app in Windows Phone Store to boost the signal strength of the phone and help to increase network bandwidth too. Does the windows phone has the capability of boosting signal?
As of today
Windows Phone 8 SDK does not expose any API you can manage the way signal is used by the device.
You can find more about what can be done in apps in What's new in Windows Phone SDK 8.0
Firs thing - Windows phone applications dont have access to Hardware level . They are sandboxed and they cant access much of the hardware component unless they are exposed . There are methods to get the signal strength because that API is exposed but there is no way to boost the signal strength !!