I bought the phone through Walmart but we have the phones through t mobile monthly. But they said we changed our bill. I heard people exceed 10 gigs on a unlimited data plan and don't get throttled.
Assuming you are talking about the plan here
TMobile Monthly 4GAt the bottom they say this.
Network Management: Data traffic of postpaid plans with limited high-speed data allotments greater than 2GB will be prioritized over other currently offered plans during periods of congestion. Service may be slowed, suspended, terminated, or restricted for misuse, abnormal use, interference with our network or ability to provide
quality service to other users, or significant roaming.
If that isn't your plan, you still should check your ToS.
Almost all unlimited plans throttle your speed.
I've been with straight talk not knowing that they will throttle me until I used roughly 5gb of data and then they cut my internet off completely on my phone.
I've learned to read the ToS from then on with any plans I buy.