Wi-Fi works on my Laptop.but not on my iPhone?

I've done what I could to see what the problem was. I "Forget this network" on my iphone under Wi-Fi settings and tried to reconnect and nothing. Interestingly, At the beginning of connection, FB, Google and some random sites will go through but others won't. I don't understand what the issue could be?

This happened to me about a year ago. I don't know how I fixed it, but I would suggest contacting apple.