Unable to make/receive call from Lenovo TAB2 A10-30 (Lenovo TB2-X30L) I have a Lenovo TAB2 A10-30.

Model Number: Lenovo TB2-X30L
Serial Number: XXXXX

I can send and receive messages but unable make or receive a calls. I have downloaded and install many phone dialer apps from google play store, but it is useless.
The voice call function is not available on this tablet, the SIM slot is there for DATA connection only.