Unable to connect any network in India

[aadityakundu]

Dear friends..
i am a new member. I have bought some tablets from China and they are unable to make phone call in India. Please give me some suggession so i can make them working. I am having a huge loss. below is the configuration of that tablet... please help..

1. cpu:VIA MW8650 800MHz
2. Display: 7 inch TFT LCD module
3. panel: Resistive touch two points
4. ram: 256MB DDR2
5. hard disk: 2GB
6. Battery type: 2400mAh/7.4V Lithium-ion
7. Battery life: 3 hours for movie
8. 3G: external 3G
9. WiFi: 802.11b/g
10. Build-in PC: 1.3 Mega
11. Speaker: Biuld-in speaker
12. SD Card Slot: Support TF card (max 32GB)
13. USB: 1*24 PIN USB PORT
14. Headphone: 3.5mm Audio-output
15. DC: 1*DC jack 9V 1.5A
16. G-Sensor: 4 way G-sensor
17. OS: Android 2.2 Support Flash 10.1
18. MS Office: Word, Excel, TXT, PDF, Powerpoint Etc and editor
19. Recorder: MP3, WAV, Recorder (720 x 480) @ 30Fps
20. Photo: JPG, BMP, PNG, GIF etc
21. Audio: MP3, WAV, AAC, AMB
22. Video: AVI, RM, RMVB, MKV, WMV, MOV, MP4,PMP,MPEG, MPG, FLV, 3GP,MPG, Flash etc.
23. Weight: 800g
24. Gift box size: 230mm*145mm*65mm
25. Carton size: 470mm*335mm*305mm
26. Total weight: 20PCS/CTN 16KG

waiting for your kind reply.
thanks