My iPhone 5c connection is so slow

So I recently got the iPhone 5c from T-mobile and it was great the first two days, the internet connection was super fast and everything.
Then it went all super slow, I can't even watch YouTube videos cause its that slow or load some pages!
Also, on the top left corner where it's says its signal strength reads: LTE or sometimes 4g. I thought these meant it was supposed to be better?

You need to call your carrier and find out what's going on.

Same whith me i don't regreat to get an iphone i just hate it if its slow

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