Calls not working on my phone with Volte activated (Data works fine)

Hi everyone,

I’m looking for some technical advice regarding my Tecno Pova 7 Pro 5G on the Smarty network.

Since earlier this week, I have been unable to make or receive any phone calls. When I try to dial, I get a "Mobile network not available" error. However, my 4G/5G data is working perfectly at full speed.

I’ve already tried the following troubleshooting steps:

Performed a network reset.

Verified APN settings are correct (mob.asm.net).

Used the *#*#86583#*#* code to disable the VoLTE carrier check.

The "VoLTE Provisioned" flag is active in the *#*#4636#*#* menu.

Tested the SIM in another phone (it works fine there).

It seems my device is struggling to register for IMS/VoLTE on the Three/Smarty infrastructure now that 3G is being phased out in my area. Even though the hardware is fully 5G/VoLTE capable, it isn't "handshaking" correctly with the network for voice services.

Has anyone managed to get a Tecno device successfully registered on Smarty's VoLTE? Or is there a way for a moderator to "refresh" the VoLTE flag on my account/IMEI to see if it forces a registration?

Any help would be greatly appreciated as I’d love to stay with Smarty!