My iphone 4's wifi works fine, it detects wireless network, but it has pretty weak signal compared to the laptops in our house and my ipad. My ipad can get a wireless signal from my basement and the router is on my third floor room. While the farthest the iphone can get a signal is the the second floor. Once I get to the first floor with the iphone, it will either go to one bar, or just give me the 3G again. Same thing when I'm in college, certain places the iphone can't detect a wireless signal, the ipad can easily without a issue. Is that normal or should I call apple?