My IPhone 5s won't connect to 4G network?

I have T-mobile. I looked at other questions and answers online and my enable LTE is on. It worked at home but right now I'm in Pennsylvania and it's not working. It doesn't even show in the corner that I have 4G. Anything I might have forgotten to do?

Just because you CAN connect to 4G, doesn't mean you WILL. There may not be a 4G signal in your area. For instance, at home my girlfriend has 4G service. When at my parents house, she does not. That's not a problem with the phone, that's due to a lack of 4G service in the area where my parents live. Nothing can be done about that.

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