Why is there an E instead of 4G?

I have a jailbroken iPhone 4S. And I have 4G on it. I downloaded an app which turned off my cellular usage. When I turned it back on its not 4G it's an E next to where it says ATandT. How do I make It say 4G again.

IPhone 4S is not a 4G phone, it's a 3G phone. If you set up the APN right, it'll show 3G but never 4G. Jailbreaking the phone and using such apps will only show 4G but the hardware is only for 3G so you'll get 2G or 3G even though it shows 4G.

E stands for Edge which means can't get good enough signal for 4G or 3G and goes to the lowest speeds which is 2G

It may take time to regain 4G access. Also why would you need an app to do that? You could do that on the phone without any jailbreak or extra app.

E by the way would be for EDGE basically 2G.

Try checking your APN settings.

Settings > General > Cellular > Cellular Data Network

make sure they are what they need to be, and reboot if necessary.

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