Whats the E symbol on the pantech duo phone mean?

I just got a pantech duo and on the buzz i get a small icon with that letter E and sometimes it says 3G. Whats that E mean?
Yes, it’s att. sometimes when i have the E up i can’t use my camera (the thought says “can not support” o r”not enough data/memory space”) so how do i make the E go away if i need to use my camera?

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