dataspeeds after 5gb usage are slow

I been a t-mobile customer for one week now and I am thinking about returning my mifi. I used up my 5GB and now for the last two days the speeds are so slow (slower then at&t's 3g). Why is that t-mobile data is so slow.

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T-Mobile's data is not "so slow"...

You said "I used up my 5GB"...

That's why your data speeds are slow.

T-Mobile, like most other wireless providers, will reduce data speeds once you hit your data cap (5GB) within one billing cycle. Your data speeds may continue to be slow into next billing cycle, depending on when they choose to raise the speeds again.