With the Samsung Galaxy S3 users expecting the roll out of newly released Android 4.1 Jelly bean operating system to their devices shortly, the one thing which makes them frustrated is the non-availability of USB Mass storage mode in the device.
Samsung have replaced USB Mass storage mode (UMS) with Media Transfer Protocol (MTP) in Galaxy S3. Although MTP has its own advantages, it is not supported by all operating systems and it can be connected only with the help of third party tools which is being considered as a major disadvantage.
Well, to fix this issue and let Galaxy S3 users use the UMS, the guys at XDA developers has come up with a standalone application. If you want to get rid of the MTP and use USB Mass storage mode, then follow the instructions given below.

Important: Since there is no rooting procedure involved with this process, your device warranty will not get void.
- The instructions given below is for enabling the USB Mass storage mode in Samsung Galaxy S3 GT I9300 Android device. So don’t try it with any other device.
- Though there is no risks of losing data from your device during this process, it is highly recommended to take backup of all your contacts, SMS, MMS, Call logs, etc., using appropriate data backup applications.
Once you have followed these instructions, you can move on and proceed with the tutorial given below.
How To Enable USB Mass Storage Option In Samsung Galaxy S3
- To get started, download USB Mass Storage (UMS) APK file from here to your computer.
- Connect your Galaxy S3 using a USB data cable to the computer, and transfer the APK file to the device. Once done, disconnect the device from computer.

- Now navigate to the APK file in your device and follow the on screen instructions to complete the installation process.

- Once done, you can open the application and select any options as shown in the screenshot given above.
That’s it. Now you have successfully installed an external application which will enable USB Mass storage mode in Samsung Galaxy S3 GT I9300.
Check out the original post over at BestAndroidBlog
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will this work for the galaxy s3 SGH 1747 as well if not what will
All I want to do is access re moveable sd card,with out disabling my dam phone! Could with my HTC Desire. new OS ??
Well this doesn’t work unless the Phone is rooted. Have tried many times different ways, it still asks for root permissions.
Please see how XDA can help without rooting the phone.
This wont allow me to run the UMS mode, since it comes up with a message saying, “Could not get root privileges” Do I have to root the device? I’d much rather not root it than root it
is it necessary to root s3 for this purpose .