why does my iphone 4s always say "Searching..." when i turn it on?
The reason why your iPhone 4S says "Searching" when you turn it on is because the phone is trying to access networks that are in range. If it takes long to find networks, you should go to settings>network settings>search for available networks.
It is trying to get a signal. You couldn't figure that out?
Its trying to find the network because the phone itself was powered off. So when its powered on its searching for the network so it can connect back to it