There are many tab's available in the market to buy but I would like to suggest you with the two best tab's from them which comes with calling feature and with a cheap price tag. I have mentioned them below mostly with all the features:
Micromax Canvas Tab P470 (Rs. 7,497)
It was released in the month of December, 2014. It is powered by the battery of 3200 mAh. It is available in two colors and they are Classic Silver and Mystic Grey.
It comes with the big size screen of 7.00 inches which gives a better view to the users in comparison with many other devices. It comes with the resolution of 1024 x 600 pixels which helps it to give a clear view to the users.
It runs on MediaTek MT8312, 1.3GHz dual-core processor with 1 GB of RAM so that it can always give a better smooth performance in comparison with many other devices. It comes loaded with the internal storage space of 8 GB and the external storage space can be expanded using microSD card up to 32 GB.
It has a rear camera of 5 MP with flash feature so that users can click photos in a great clear quality. But when it comes to front camera it does not have much to give you a good quality of photos or videos as it has a front camera of just 0.3 MP.
Software & Connectivity
It runs on Android 4.4.2 which allows users to play mostly all the Android games. It supports Wi-Fi 802.11 b/ g/ n, GPS, Blue-tooth v4.00 so as to share data between the connected device, 3.55 mm jack for headphones connectivity, FM and Micro-USB. It can also be charged via Micro-USB and supports dual SIM feature.
It comes loaded with some sensors and they are Compass/ Magnetometer, Proximity and Accelerometer.
Micromax Canvas Tab P666 (Rs. 9,722)
It was released in the month of November, 2014. It weighs 310 gram. It is powered by the battery of 4400 mAh. It is available in the two most basic colors and they are Black and White.
It comes with the large size screen of 8.00 inches which supports the resolution of 800 x 1280 pixels which can easily give you a better view in comparison with many other devices.
It runs on Intel Atom Z2520, 1.2GHz dual-core processor with 1 GB of RAM. It comes loaded with the internal storage space of 8 GB and the external storage space can be expanded using microSd card up to 32 GB.
It has a rear camera of 5 MP and a front camera of 2 MP which can give good quality of video and photo output.
Software & Connectivity
It runs on Android 4.4.2 and also supports Java. It supports Wi-Fi (802.11 b/ g/ n), GPS, Blue-tooth v4.00, 3.55 mm jack, Micro-USB, 3G network and it can be charged via Micro-USB.
It comes loaded with four sensors and they are Proximity, Accelerometer, Ambient light and Gyroscope.
As per my opinion these two will be the best device for which you are looking for. I have mentioned all the features of them along with their price tag so that you can compare it with other devices to know the best one for you. You can buy any of them from various online mega stores.
I find that the harder I work, the more luck I seem to have.