I got a Tello eSIM today and I had the same issue: voice calls were fine but could not get mobile data. (FYI, I am running Iode OS version 6.6 instead of version 6.3 that the Brax3 shipped with, but I doubt that has anything to do with the issue or its resolution.) I was able to resolve the issue by following these two steps (your mileage may vary):
- I performed a factory reset (search for factory reset in settings). At least in my case, this operation preserved the Tello eSIM configuration
- I set the APN during Iode setup phase with these settings that user wardee posted in another thread (Don’t set your wifi during this phase. You can do that later. Under mobile data you can find the APN menu. Click on the “+” button to add your APN) :
- Name: Tello
- APN: wholesale
- Proxy: (leave blank)
- Port: 8080
- Username & Password: (leave blank)
- Server: (leave blank)
- MMSC: http://wholesale.mmsmvno.com/mms/wapenc
- MMS Proxy: (leave blank)
- MMS Port: (leave blank)
- MCC: 310 (I did not have this field, so I skipped it)
- MNC: 240 (I did not have this field, so I skipped it)
- Authentication Type: (leave blank)
- APN Type: default,supl,mms (make sure all others are unchecked)
- APN Protocol: IPv4/IPv6
- APN Roaming Protocol: IPv4/IPv6
- Bearer or Network Type: LTE or Unspecified (I left it as Unspecified )