Why is my lte slow on my iPhone?

Just got a brand new iPhone 5s and the first day the lte was great running at about 20mb down and about 15 up now it is the third day and it runs 3 down and 2 up but when I cut my lte off the 4g runs at 5 down and 1 up I'm on tmobile any reason why it does this? It does this where ever I go

Try to reset it using iTunes.

LTE doesn't work very well inside buildings.

LTE gets boosted near the vendors… I don't know the average speeds of tmobile but I do know the offer cheap service which usually means less… I get 65 down and 20 up with verison

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