Tmobile iphone has letter E instead of 4g?

My iphone was working fine the day before & now when i woke up it has the letter E instead of 4G

It could the network: EE.
https://www.t-mobile.co.uk/....co.uk/ee/

E stands for edge, which is their slowest data network. Either you're in a bad coverage area or, it's possible that you went over your high-speed data limit and will be stuck with slow data until your next billing cycle.

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