My iphone won't let me go on my internet?

Either when I log off Wi-Fi or leave somewhere where with Wi-Fi off I can't go on my internet. I have the AT&T family plan thing and I'm on my brother line with other people but the thing is it only happens to my phone no one else's I have the iPhone 5s. The bill is paid for and the weird thing about it is I can txt but it won't let me get on my internet

This is the message that always pop up when I get on my browser: We're sorry, but you have reached the data limit set by your wireless account owner. If you would like to continue browsing or have completed a mobile purchase, i.e., game, and now can't complete the download, your Data Limit allowance needs to be increased by the account owner via the AT&T Smart Limits for Wireless website. Overage charges may apply depending on your data plan. You have 24 hours to complete the download from data/time of purchase.
My iphone won t let me go on my internet

Looks like you have used up all of your att data.turn off cellular data and turn on your Wi-Fi tht shoudd work. Setting>cellular>cellular data(turn it off).

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