Tablets with calling functionality are gaining traction in the Indian market. But at the same time, one needs give due consideration to its hardware like Processor for a smoother experience. Thus we have here listed only those calling tablet which have quad core processor. 
We have listed the tablets in alphabetical (A-Z) order.
HP Slate 7 VoiceTab – Rs 10,594
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The HP Slate 7 VoiceTab has a 7 inch HD IPS display with a resolution of 1280 x 800 pixels, resulting in a ppi of 216. The 1.2 GHz quad-core processing unit of the HP Slate 7 VoiceTab runs with 1 GB of RAM. The internal memory stands at 16 GB which can be supplemented by another 32 GB via a micro SD card. Also it has a 5 megapixel primary camera and a 2 megapixel front camera. The HP Slate 7 VoiceTab is a Dual-SIM device with 3G, Bluetooth 3.0, GPS, WiFi, etc. The 4100 mAh battery seems large enough for a full day of usage.
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The Acer Iconia A1-713HD comes with a 7 inch IPS display with a resolution of 800 x 1280 pixels. The Acer Iconia A1-713HD has a 1.3 GHz quad-core processor with 1 GB RAM. The tablet has superb 16 GB internal storage as well as a 32 GB micro SD card slot. Besides, the tablet offers a 5 megapixel primary camera, a VGA front camera, WiFi, Bluetooth, GPS, and a 3400 mAh battery.
Huawei MediaPad7 Youth 2 – Rs 6,999
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The Huawei MediaPad7 Youth 2 is equipped with a 7 inch TFT display with a resolution of 600 x 1024 pixels, resultinin a Pixel density of 170 ppi.
The quad-core 1.2 GHz processor runs with 1 GB of RAM. The internal storage stands at 4 GB, which can be expanded by another 32 GB. The Huawei MediaPad 7 Youth 2 has a 3.15 megapixel primary camera, with geo-tagging and auto-focus features. There is a VGA camera in the tablet for video calls. The 3G tablet has WiFi, GPS, and Bluetooth. The Huawei MediaPad7 Youth2 has a 4100 mAh battery.
iBall Slide 3G 1035 Q90 – Rs 14,599
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It is armed with a 10.1 inch HD IPS display, a quad-core processor clocked at 1.2 GHz, and 1 GB of RAM. It offers 8 GB of internal storage and has a 32 GB micro SD card slot. The 8 megapixel primary camera is armed with auto-focus, flash, and video recording features. The front has a 2 megapixel camera. The iBall Slide 3G 1035 Q90 is a dual-SIM tablet with WiFi, 3G, GPS, Bluetooth, etc. The 6000 mAh battery is enough for 10 hours of Talk time or 840 hours of standby.
Note that it is being sold in excess of Rs 15,000 by most retailers except Amazon which is offering it for Rs 14,599.
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iBall Slide 3G 1026 Q18- Rs 11,000
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The iBall Slide 3G 1026 Q18 has a 10.1 inch IPS HD display with a resolution of 1024 x 600. The tablet has a 1.3 GHz quad-core processor running with 1 GB of RAM. The internal memory stands at 8 GB, and another 32 GB can be added as well via a micro SD card. In its rear there is a 5 megapixel auto-focus camera and a flash light while in the front it has a 2 megapixel camera. The iBall Slide 3G 1026 Q18 has 3G, Bluetooth, WiFi, GPS, etc for connectivity. The 4600 mAh battery should be enough to last an entire day of usage.
iBall Slide 7803 Q900 – Rs 9,799
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The 7.85 inch TFT display of iBall Slide 7803 Q900 has 1024 x 768 pixels resolution. The iBall Slide 7803 Q900 has a 1.3 GHz quad-core processor with 1 GB of RAM. The internal memory stands at 16 GB, while you can add up to a 32 GB micro SD card to extend its memory. The tablet has a 5 megapixel primary camera and an LED flash light. In the front, the tablet bears a 2 megapixel camera for video calls, selfies, etc. The iBall Slide 7803 Q900 is equipped with 3G, GPS, Bluetooth, WiFi, etc. It has a 4000 mAh battery.
iBall Slide 3G 7345Q 800 – Rs 9,500
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The iBall Slide 3G 7345Q 800 has a 7 inch IPS display with 1280 x 800 pixels resolution. It too offers 1.3 GHz quad-core processor, 1 GB of RAM, 8 GB ROM, and a 32 GB micro SD card slot. The tablet has a 5 megapixel camera and a flash light in the rear panel while a 2 megapixel camera is there on it front. The iBall Slide 3G 7345Q 800 is a dual-SIM device with 3G, GPS, WiFi, Bluetooth, etc. The iBall Slide 3G 7345Q 800 has a 3000 mAh battery.
iBall Slide 3G 6095 Q700 – Rs 8,100
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The iBall Slide 3G 6095 Q700 has a 6.95 inch IPS display with a resolution of 1024 x 600. The iBall Slide 3G 6095 Q700 has a 1.3 GHz quad-core processor with 1 GB of RAM. The internal storage on offer is 16 GB, to which another 32 GB can be added via a micro SD card.
The Slide 3G 6095 offers a 5 megapixel rear camera, VGA front camera, 3G, WiFi, Bluetooth, GPS, and a 2600 mAh battery.
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iBall Slide 3G Q7271 IPS20 – Rs 7,449
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The iBall Slide 3G Q7271 IPS20 has a 7 inch IPS display with a resolution of 1024 x 600. Besides, it offers 1.3 GHz quad-core CPU, 1 GB of RAM, 8 GB ROM, 32 GB microSD card slot, 2 megapixel rear camera, and a VGA camera on the front. The iBall Slide 3G Q7271 IPS20 comes with 3G, WiFi, Bluetooth, GPS, etc. It has a 3000 mAh battery.
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The Lenovo A7-30 3G has a 7 inch TFT display with a resolution of 600 x 1024, meaning it has a pixel density of 170 ppi. The Lenovo A7-30 3G runs a 1.3 GHz quad-core processor with 1 GB of RAM. The internal storage is 16 GB, to which another 32 can be added. The 2 megapixel primary camera is a fixed focus shooter with geo-tagging and video recording. A VGA camera is present for video calls. The 3G enabled tablet has Bluetooth 4.0, WiFi, GPS, etc. The 3500 mAh battery can provide 336 hours of standby or up to 8 hours of usage.
Lenovo IdeaTab A 3000 – Rs 13,798
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The Lenovo IdeaTab A 3000 is equipped with a 7 inch IPS display with a resolution of 600 x1024 pixels. The tablet has a quad-core processing unit clocked at 1.2 GHz, running with 1 GB of RAM. The internal storage stands at 16 GB and an additional 64 GB can be added via a microSD. The Lenovo IdeaTab A 3000 has a 5 megapixel primary camera with auto-focus and geo-tagging, and it can record videos at 1080p at 30 fps. In its front there is a VGA camera for calling, selfies, etc. The Lenovo IdeaTab A 3000 is a 3G enabled tablet with WiFi, GPS, Bluetooth 4.0, etc. The 3500 mAh battery is enough 8 hours of talk time or 336 hours of standby.
Micromax Canvas P650 – Rs 14,399
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The Micromax Canvas P650 is equipped with a 8 inch IPS display with a resolution of 768 x 1024 pixels, resulting in a ppi of 160. The Micromax Canvas P650 has a 1.2 GHz quad-core processor, running with 1 GB of RAM. The 16 GB internal memory can be expanded by another 32 GB via a micro SD card. The Micromax Canvas P650 has a 5 megapixel camera with auto-focus, geo-tagging, and video recording at 30 fps. The Micromax Canvas P650 is a 3G enabled tablet with WiFi, Bluetooth 3.0, GPS, etc. The 4800 mAh battery is enough for 10 hours of talk time or 400 hours of standby.
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Like all the tablets in this list, it too has calling functionality as well as a quad core processor. Besides, the Canvas P660 offers Android 4.2.2 Jelly Bean operating system, 7.85 inch display with 1024×768 pixels resolution, 5 MP rear camera, 2 MP front camera, 1 GB RAM, 32 GB micro SD card slot, 4 GB ROM, and a 4000 mAh battery.
The Canvas P660 offers 3G, WiFi, FM radio and Bluetooth.
Milagrow M2 Pro (32 GB) – Rs 12,990
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The Milagrow M2 Pro has a 7.9 inch IPS display with a resolution of 1024 x 768 pixels. The tablet has a quad-core 1.6 GHz processor with 2 GB of RAM. The internal memory is 32 GB which can be expanded by another 64 GB. The tablet has an 8 megapixel primary camera which can record videos in full HD resolution, while in the front there is a 2 megapixel camera. The Milagrow M2 Pro is a 3G enabled tablet, so not only does it have 3G, but WiFi, Bluetooth, GPS, and calling too. The tablet has a 4000 mAh battery.
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The Swipe MTV Slash 4X has a 7 inch IPS display, with a resolution of 600 x 1024 pixels, meaning it has a pixel density of 170 ppi. IPS technology allows for wider viewing angles. The quad-core 1.3 GHz processing unit of the Swipe MTV Slash 4X runs with 1 GB of RAM. The tablet has 4 GB of internal storage, which can be expanded by another 32 GB via a microSD card. The tablet has a 2 megapixel primary camera and a secondary VGA camera. The dual-SIM Swipe MTV Slash 4X is 3G enabled, and also has GPS, WiFi, Bluetooth 4.0, etc. The 3000 mAh battery though looks a bit small for a tablet with a 7 inch display.
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The Xolo QC 800 has an 8 inch IPS display with a resolution of 1024 x 768 pixels, resulting in a pixel density of 200 ppi. The quad-core processing unit of the Xolo QC 800 is clocked at 1.2 GHz with 1 GB of RAM. The internal memory of 4 GB can be expanded by another 32 GB. In its rear, there is a 2 megapixel camera while a VGA camera is in its front. The Xolo QC 800 is a 3G enabled tablet with Bluetooth 3.0, WiFi, GPS, etc. The 4000 mAh battery can provide 16 hours of talk time or 380 hours of standby.