How to Connect any 3G Dongle to any Android Tablets

Working on-the-go nowadays usually means a laptop or tablet with mobile broadband access—either through tethering your mobile device or a separate dongle with a mobile broadband plan. In most situations, WiFi tethering your phone would be enough. However, if you do require extended periods of time connected to the Internet, you might be able to save yourself some battery and convenience with a USB 3G adapter. However, what do you do if your tablet isn’t compatible with your dongle?

Developers has figured out a way of bypassing this incompatibility, allowing for any 3G broadband dongle to connect to any rooted Android tablet. A process that may seem a bit daunting to some, it requires ES File Explorer to be installed with root access and terminal software on your PC and tablet.

To accomplish this, you must install an APK on your tablet, as well as run two scripts that are available in the guide.we have included screenshots for extra guidance, and he has also acknowledged a small bug where the mobile broadband icon is not displayed in the status bar. However, this won’t affect functionality.

We have found a way to connect any modem to the tablet even if the tablet does not recognizes it. your device must be ROOTED to do so. I am not a developer, i just found out somewhere and modified the instructions to make it easy. i am not responsible to any thing that happens to your device (however this method isn't risky at all).

Just follow the instructions and enjoy. First download the attachment...

ATTACHED FILES

	Guide.zip - [Click for QR Code] (32.1 KB)
	Screenshots.zip - [Click for QR Code] (946.4 KB)

First you need to move the modem to "modem only" for this you will need a terminal, you can use Hyper Terminal on windows.
Google search for AT commands for your modem to make it modem only mode and how to do that.

All right .... transferred the modem to the modem-only mode .... 

Then note the vid and pid of your modem. one way to do this is to connect the modem to computer then go to device manager, expand modems, right click your modem >properties>details. 


2. Next we need ES File Explorer

Install it on your tablet ... Open, go to settings -> Root rights, and tick all checkboxes.

3. Then go to /system/bin/preinstall.sh on your tablet and add a line to the file using es file explorer echo "19d2 1176" > /sys/bus/usb-serial/drivers/option1/new_id (see my preinstall.sh in the archive).

here 19d2 is my modem (vodafone K3370-z) vid and 1176 the pid. replace the vid and pid with your own.

REEBOT YOUR TABLET

(click the images to view it enlarged)

4.There is a folder peers in the archive you downloaded. open conf-chat in the folder with es file explorer and replace your apn here with the apn of your service provider . 

When the tablet does not recognize the modem it will not generate ttyUSB files which are needed to communicate with the modem. In Step 3 you made the tablet to recognize the modem and it now generates the ttyUSB files. You can check that in Terminal emulator(download from play store) by typing "dmesg" command(without qoutes). scroll the output down, you will see the generated ttyUSB ports as given in attached screenshot Pic1.

It also gives the number of ports genetated. If you see these lines you can Connect your modem to Internet. But wait a minute you have additional things to do in order to get connected.

Now you need to find which port is pppd port because we need it to insert in the file Conf-pppd in peers folder of the archive you downloaded. (open the conf-pppd using wordpad you would see ttyUSB1 on the top because pppd port of my modem is 1, those modems who has pppd port at 1 would be able to connect without any modifications, if the pppd port of your modem is not 1 you would have to edit it e.g if the pppd port of your modem is 2, the top line in conf-pppd would look like ttyUSB2 and so on)


To determine which is pppd port follow the below steps...(see the attached screenshots)

Open 2 windows in terminal emulator. (you can copy paste the commands in terminal emulator)

(1) In first window type busybox tr -s "\n" < /dev/ttyUSBx (Pic2)

where x is the first port generated by your modem.(this command opens the port)

(2) Now in window 2 type echo -e "ATi\r" > /dev/ttyUSBx (pic3)

Here x is the same you typed in window 1.
You would see OK in WINDOW 1(Not in window 2). IF YOU DONT SEE ANY OUTPUT IN WINDOW 1(pic4),

YOU HAVE TO UNPLUG YOUR MODEM AND PLUG IT AGAIN AND THEN USE NEXT PORT. yOU HAVE TO DO THIS EVERY TIME YOU DONT SEE ANY OUTPUT. IF YOU DO SEE AN OUTPUT PROCEED TO NEXT STEP.(pic 5, 6, and 7)

(3) Again type echo -e "AT+CGDCONT=1,\"IP\",\"www\"\r" > /dev/ttyUSBx in window 2. (Pic8)

Here replace www with your apn
You will see the OK again in window 1.(pic9)

(4) Again type echo -e "ATDT*99#\r" > /dev/ttyUSBx in WINDOW 2(pic10)

You will See the output in window 1. if you see ERROR in window 1, then it is your AT port not PPPD port. Unplug your modem and try next port untill you get CONNECT message in window 1(pic11)

. If you get Connect Message the at any port then it is your pppd port. IF you get these messages at port 2, then replace 1 in ttyUSB with 2, ehich then reads ttyUSB2 at the top of conf-pppd file.

Now copy the folder Peers in /etc/ppp/ in your sd card.

Install the application GScript_Mod.apk lies just in the archive .... open it and add the two scripts in the folder gscript of your sdcard : inet-ON.sh (Which brings up connection) and inet-OFF.sh (which disables the connection)

5. REBOOT TABLET. insert the modem. Start the application Gscript and run inet-ON.sh(pic12)

If you do everything on the instructions, your modem will connect to the Internet, although you will not see the 3G connection on the tablet...(pic13)

Thanks for reading..