My Iphone 4s's 4g isn't working?

I know at&t doesn't have 4g, but i'm just going by the logo on the top. But recently this week, my phone can't acces the internet without Wi-Fi. Everyone else in my family can, and they all have an iphone 4. I also don't want to restore it because then i will have to update it, and i don't want to update it. Please help, i need the connections for when i'm traveling!

Lol
iphone zombies are so funny

Well, you will probably have to update it. But, don't update it if the phone isn't recommending the update. My iPhone recommends the update. You'll probably have to turn on the Wi-Fi. When I first got my iPhone, it let me use Internet without Wi-Fi. Then, it made me use Wi-Fi. It's just how the phone works something. Really depends how long your phone will let you! Hope it helps!

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