My A01 doesn't wanna receive calls it goes straight to voicemail what can I do

[Chumile-Anda]

Call your network carrier's customer service and ask them to assist you.

[sipek]

Try turning on airplane mode and then turn it off
It may help you
And if you have dual sims try putting the sim in the other tray
You can also restart your device (60%work)

Thx for your attention and I hope your problem fixed and you receive calls again