Thanks for posting to our community! Some of those speeds are definitely below the typical LTE speeds but a majority of they are within the range .
Download speeds: Typically between 7 – 40 Mbps, with peaks up to 90 Mbps and minimum expected speeds of less than 0.1 Mbps
Upload speeds: Typically between 4 – 20 Mbps, with peaks up to 35 Mbps and minimum expected speeds of less than 0.1 Mbps
With these kinds of spikes, it is possibly a network congestion type of issue. We can look into this area for you if you contact us so our tech care folks can gather some of the more specific account details.
I wonder if you guys resolved this issue. And yet i see that it has not... Spikes are still there and i do not get what i have paid for. Also you guys should stop advertising the fastest internet because i could not do simple video call with my parents who also live in US and use t-mobile. 4G unlimited and i can't even do video call that actually featured on the phone i didn't even used other app. During 3 mins of video call i had about 5 secs of good video quality that actually didn't crashed quality and graphics. Am i the only one suffering with this network issue? If so, i would like to know if i am not worthy enough in your perspective. I am getting tired of this whole troubles i am going through with t-mobile