New customer account here with 3 lines on the One plan. I had previously tested coverage and speed with a pre-paid T-Mobile traveler SIM in my iPad. All worked great (coverage for me is even better than with AT&T) including snappy web page loading and in-app data intensive activity. 2 new iPhones work awesome and have 20+ Mb/s speeds confirmed by OpenSignal.
iPad is dog slow though (it wasn't on pre-paid SIM). OpenSignal says ~ 0.5 Mb/s next to iPhone with 20+ Mb/s. Other threads seem to say tablet needs One Plus to work correctly.
Is One Plus still "the answer" ? I totally understand the tethering throttling...not quite as understanding why using the iPad is treated completely differently than the same apps on iPhone.
Best answer by tmo_chris
The speeds you are getting on the Tablet T-Mobile One plan are normal (Unlimited 3G Smartphone Mobile Hotspot (up to 512 kbps). When you were on a prepaid plan, you more than likely had an allotment of high-speed and once that high-speed ran out, you would be limited to 3G speeds.
If you want, you can add the One Plus feature ($20) for the tablet and get unlimited high-speed data on the tablet.