AT&T contract,suddenly lost my LTE connection on my iPhone 5

just have signed up an at&t contract for less than a month, and suddenly my iphone lost LTE connection a few days ago. no matter how many times i reboot or reset the network settings, my iphone just can't connect to the internet. strangely however, some apps (sns apps) are still able to send and receive messages. it really annoys me a lot. anyone here with the similar problem? really need some help. btw i'm in chicago

Hi jun xia,
If you are having issues with the AT&T LTE connection on your iPhone, you may find the following article helpful:
iPhone: Troubleshooting a cellular data connection
http://support.apple.com/kb/ts3780
Regards,
- Brenden

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