My iphone 5s internet won't work unless its connected to a Wi-Fi?

When i'm outside my internet never works, i have 4g and its always turned on, i'm on 02.
On top of the iphone when i'm out it either say's 'E' , 'gprs' or '3G' but whatever one it says the internet still dosnt work.

Has it ever worked? Do you have a data plan? Can you make calls and texts away from Wi-Fi? Taking it to a phone store would probably get you the fastest answer. You might need a new SIM card.

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