Hi Tom,
Sorry to hear the trouble you’re experiencing out in the field. How’s your cell phone coverage in the area when you’re attempting to make calls?
Couple thoughts to try to isolate this issue further:
- Use the Smart Connectivity Tool within the mobile app to check the quality of your network connection. This video provides a brief overview: How to Use 8x8 Smart Connectivity Test
- Using another T-Mobile cell phone with the 8x8 Mobile App to see if that makes a difference.
Let me know how this goes. I’m interested to hear your thoughts.