Voice over LTE (VoLTE) is not on by default. What could be happening is there are no 3G or 2G towers to complete your call. You can try to activate VoLTE and see if that improves the situation. I don’t have the instructions handy but if you search the forums you may be able find them posted.
Ok went through with that and still getting same result (Instantly going to Call Ended. NoNetworkFound). In the other thread it mentioned stuff about firmware version? I also saw mention of checking the FW in the gui app, but for some reason the gui tool couldn’t open up the display so I ran that manually too!
I tried digging into this VoLTE calling issue more tonight. Since the bm818-tools utility confirmed that VoLTE was enabled and without a better idea I figured I’d continue down the talking to Modem directly to figure out if I could learn anything new.
In the end, the ATD(phone number) command returns: NO CARRIER
AT+CEER returns: No cause information available
AT+COPS? returns: 0,0,“Mint”,7
AT+CEREG? (Seems like this is the important one for volte)
all returned: 0,1
Doesn’t the ,1 mean it is registered?
AT+CGDCONT? returned a line that has the ims information.
So I don’t know if any of that is relevant, but seems like registered for a volte voice call seems completely different than the rest of it, because I certainly have a carrier connection if I have IP addresses & text messaging working?
So I guess the scary question is If the carrier didn’t accept this modem for VoLTE use, wouldn’t the CEREG response be different?
Is there any chance that:
aren’t the right values for T-Mobile?
In the end, it would be neat if any of this research could help make the top status more realistic because a normal user would look at this screen and say everything is good and that’s not the truth.