IPhone 4S won't play youtube videos?

I got a new router and modem and now I can't play youtube videos on my iPhone 4S. It's not the router because I can use my iPad and videos work and my family members iPhone 4S works as well. Why do videos just load until they time out even on the youtube app?

1. Check your network settings if you are unable to open the YouTube application. Press the "Home" button and tap "Settings." Tap "General" and select "Network." Switch the "Cellular Data" field to "On" if it is off. Press the "Menu" button and attempt to access YouTube again.

2. Press and hold the "Home" button for six seconds if YouTube freezes. The application should close. If not, turn off the phone by pressing and holding the "Sleep/Wake" button on the top of the iPhone. Drag the slider bar that appears on your screen and wait for the phone to power off. Wait 30 seconds and turn the phone back on. Attempt to access YouTube again.

3. Check your volume settings if you are unable to hear YouTube videos. Use the volume control buttons on the side of the iPhone to turn the volume up. If you are using a headset, ensure the connector is pushed all the way into the phone.

4. Reset your settings if you are still unable to access YouTube. Press the "Home" button and tap "Settings." Scroll down and tap "General." Tap "Reset" and select "Erase All Content and Settings."

5. Restore your phone if YouTube still does not work. Connect your iPhone to your computer and open iTunes. Click on the iPhone's name in the "Devices" panel and click "Restore." Follow the onscreen prompts to restore your phone. Attempt to access YouTube.

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