IPhone 4 Data connection isn't working?

I just went from using an Android to and iPhone 4. The AT&T people had to cut my sim card for it to fit. I can call and text on my new phone but when I go to get on the internet it says "Can't Open Page. Safari can't open the page because it is not connected to the internet.' I don't understand why because I have internet on my data plan. I have no idea how to get it to work.

The weather or the amount of people on the web could be an effect.

  • Why isn't my network connection working? I try to look for a sharing connection on my laptop but nothing shows. The whole house has Wi-Fi, my Xbox and phone find the network but nothing shows on my laptop. Why? I get 2 bars of Wi-Fi on my iPhone and 3 bars of Wi-Fi on my Xbox and nothing on my laptop not even a network. Please and thank you.
  • Why isn't my cellular data working? I have an unlocked and jailbroken iPhone 4S. I know where the cellular data is at but when I turn it on it doesn't work, & it even says 3G on the corner but I don't know why it's not working! Can someone help?
  • 3G data on my iPhone 3gs isn't working? I have 3G turned on, and for the past several days it hasn't been working consistently, it won't always connect and it'll tell me there's no current connection. It works perfectly fine on Wi-Fi though. Is there any way I can fix the connectivity with the 3G? I did a network reset yesterday, and I'm still having issues
  • My verizon 3G data isn't working? I recently bought an iPhone 4 on the Verizon prepaid plan. The first month my data worked perfectly. My minutes expired and when I got a refill, I noticed my data isn't loading. It says that it is working but nothing will load. I tried resetting everything but it still isn't working. Any suggestions on how to fix this?