Oukitel K9

Oukitel K9
Cannot make or receive calls

I got this phone to use on T-Mobile in the US I have checked and the phone has four out of the six frequencies the T-Mobile is using the only one missing is 66 + 71 I can do everything else on the phone accept phone calls I've checked settings make sure the phone automatically selects Network do not disturb is off airplane mode is off still cannot make calls please advise 

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Android 9
Simulator

Explained step by step - 177 simulator instructions
  1. First Steps

    1. Set Up

    2. Home screen

  2. Settings

    1. Accessibility

    2. Wi-Fi

    3. Mobile network

    4. Battery

    5. Display

    6. Sound

    7. Storage

    8. Security & Location

    9. Clock

    10. System

    11. Miscellaneous

  3. Apps

    1. Google Mail

    2. Chrome

    3. Messages

    4. Play store

    5. Camera

    6. Contacts

    7. Phone

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Oukitel K9: Specifications
Display7.12 Inch - IPS
ProcessorMediaTek MT6765 (Helio P35)
Memory 4 GB
Internal storage 64 GB
Camera16 + 5 Megapixel
SoftwareAndroid 9 Pie
All specifications