First of all you have to make a search for the dongles which are supported by your BSNL Penta. Check up the model of your device to find the right dongle for the same.
Tablet. Penta TPAD IS701R supports the following dongles:
Teracom T3G72A {BSNL}
Huawei E160
Reliance GSM ZTE MF190
AIRTEL HUAWEI E1731
Idea GSM HUAWEI E1732
Huawei E169G
Huawei E171
Huawei E173
Penta TPAD IS703C supports the following dongles:
TATA Photon+ EC156
Reliance GSM ZTE MF190
AIRTEL HUAWEI E1731
Idea GSM HUAWEI E1732
Huawei E169G
Huawei E173
Huawei E171
Once you have selected the right dongle for your BSNL Penta Tablet insert the same in the tablet. Check up if the dongle light blinks to make sure that it is connected properly. When the light becomes steady, this is an indication that you are connected to the internet. In case of BSNL tablet model IS701R, you can find a 'G' icon on the top bar with blinking download and upload arrows. This will happen within one or two minutes. For model IS703C/802C, the icon will be '3G' at the bottom right hand of the screen. The internet connection will be usually available after this procedure but if it does not happen, then follow the following instructions:
Open Launcher Enter Settings -> More -> Mobile Networks -> Check the Data Enabled box -> Edit Access Point Names. Check the APN (Access Point Names) in the Wireless and Network settings if it is still not connected. Consult your data service provider to help you select the correct name and then OK to confirm. In case the problem still persists, you should re-start the device keeping the dongle connected to it. The customer care can only solve your problem if nothing works out finally.
"Teaching is my passion & sharing of knowledge is my motto"
Sukhdev Singh
Lead Editor & Platinum Member at ISC