Oh man magenta1769754 that's a sad day when you're speeds are slow.
I'm not very familiar with this device. Does it take a SIM slot or a data card slot? What I'd really like to see is if you're able to test your SIM in a T-Mobile branded device and see how fast your data is. Keep us posted on this issue. We wanna give you whatever guidance we can so you can get faster data.
I am not sure what kind of card it would be considered. I don't have T Mobile phones so I couldn't try it in anything else. The speeds went back up Sunday morning.
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