IPhone 5s Tmobile 4G Internet Slow All Of A Sudden?

I just bought a T-Mobile iPhone 5s yesterday and got my sim card for my iPhone 4 cut so that I could switch over. For the first day, I had super quick internet, fast web searches and amazingly quick streaming of videos. But now, the second day, it's not going anywhere near as fast as it was yesterday. What gives? What happened? I don't understand.

Please someone help me out. I even reset the network settings in the settings.

Is it the data? Because I have LTE 4G data.

Are you on the $50 plan? You might have hit your throttle limit. You can continue using your phone without any overages.

Right now T-mobile does have a ref program where if you enter a refs info you will get the $80 plan which allows full unlimited internet for 12 months for the price of the $50 plan. If you need a ref let me know.

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