Lenovo a7-30 3g is a nice tablet with voice calling and good specifications. It has a 1.3 ghz quad core processor with 1 gb Ram which is more than sufficient to open multiple android apps simultaneously and to play basic and some heavy android games.
The storage capacity is 8gb inbuilt which is expandable upto 32gb via a micro sd card. So space issue is also not a problem in lenovo a7-30 tablet. It is a single sim voice calling tablet. Voice clarity is also nice. Wifi and hotspot feature also works smoothly on the tablet. Speaker volume is good and loud enough and has a dolby audio feature for natural and distortion free sound.
It also has 2 MP fixed focus rear camera which is just an average camera and a VGA front camera which is below par. The best feature of the lenovo a7-30 tablet is its battery backup. It has a 3500 Mah battery with 336 hours of standby time and one can browse internet for 7-8 hours on wifi on a single charge which is just awesome.