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Unlock Samsung S3 (i9300) in seconds

February 3rd, 2014 No comments

Trying to do some testing against a mobile network and wanted to use my UK T-Mobile S3; annoyingly as much as I could roam onto other networks, every time I tried to enter APN details (specifically non-matching MCC/MNC) they seemed to get automatically deleted when I saved them.

Rang up T-mobile and spoke to a lovely gentleman there, who told me I could get my phone unlocked for only £25 and with (upto) a months wait. As i didn’t relish waiting (and I’m sure the last time I spent 6 months not getting a code for my desire), I thought I’d find an easier option.

1 – Root Phone

2 -Install GalaxSim Unlock

3 -Pay GalaxSim £2.50 through the play store (T-mobile want £25)

4 -Be amazed and profit; all my APN settings are suddenly there again and it’s happy with all sorts of odd SIM cards.

5 -Be surprised it’s taken you this long to get round to it.

edit: So it turns out T-Mobile (UK) does something odd with their sim cards. Even in an unlocked phone (tested with a nexus 4), if you have a T-Mobile SIM installed then it won’t let you specify APN details that contain MNC/MCC that doesn’t match 234-30. Extremely annoying, especially as it took an hour on the phone to confirm this

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Categories: Android (G1), SGS3 GT-I9300, Technology Tags:

CW Touch Recovery on Samsung Galaxy S3

August 20th, 2012 No comments

CW Touch on SGS3

I’ve always used the clockwork mod recoveries, and apparently now they do a touch version for those phones without keyboards.

The easy install is a paid app from the market, but they give away the image for free, if you’re daring enough to flash it yourself. Here’s the easy way how (standard disclaimers apply: this worked for me, it might set you on fire. Sorry but not my fault if it does). Bits between `backticks` are commands to be executed (eg `echo “I am a command!”`).

We’re talking about the international SGS3, the GT-I900. It originally came from T-Mobile UK.

1. Get root.

2. Get the android dev tools so you can connect to your phone using adb. You’ll need to enable USB debugging too 😉

3. Head to the ClockworkMod download page and get the latest touch recovery for your “Samsung Galaxy S3 (GT-I9300)”, at the moment it’s recovery-clockwork-touch-6.0.1.2-i9300.img. Note the fact it’s a .img file.
Put this somewhere on your phone. I’m sticking it on the _internal_ SD-Card.

4. open a command prompt (`cmd` on windows) and check your PC can see your phone `adb devices`. You should see a device attached.

5. Get a shell on the phone (`adb shell`) and then get root (`su`). The end of your prompt should change from a $ to a # when you’ve got root. (eg, from “[email protected]:/ $” to “[email protected]:/ #”).

6. Change location to where you’ve got your image downloaded. On my phone/current firmware (stock samsung, latest) it’s /sdcard/, so `cd /sdcard/`. `ls` will list files, so you can make sure your image is there.
If you’re having problems finding the sdCard mount location, the _external_ sdcard seems to be at `/mnt/extSdCard` but you can get a list of mounts with `mount`.

7. Make a backup of your old recovery.
The recovery partition on the SGS3 seems to be as follows (found by WT Ho on the xda-developers forums)

/dev/block/mmcblk0p1 – unknown
/dev/block/mmcblk0p2 – unknown
/dev/block/mmcblk0p3 – /efs
/dev/block/mmcblk0p4 – unknown
/dev/block/mmcblk0p5 – kernel
/dev/block/mmcblk0p6 – recovery
/dev/block/mmcblk0p7 – unknown
/dev/block/mmcblk0p8 – /cache
/dev/block/mmcblk0p9 – /system
/dev/block/mmcblk0p10 – unknown
/dev/block/mmcblk0p11 – unknown
/dev/block/mmcblk0p12 – /data

so we’re interested in `/dev/block/mmcblk0p6`
`dd if=/dev/block/mmcblk0p6 of=./recovery-backup.img` makes a backup of our current image.

8. Blank the recovery partition:
Here be dragons! If things go wrong between now and the end of step 10, you might be buggered.
Probably not needed, but we write zeros to the recovery partition to blank it `dd if=/dev/zero of=/dev/block/mmcblk0p6`.

9. Write the new recovery -Still a dangerous place to be. Obviously you have a full battery and are in aeroplane mode?
“recovery-clockwork-touch-6.0.1.2-i9300.img” is the name of the image. If you’ve got it in a zip or tar file then you should have extracted it first. I’ve renamed it to “recoveryTouch.img” for ease.
`dd if=./recovery.img of=/dev/block/mmcblk0p6` flashes the image to the partition.

10. `sync` afterwards, because it’s just a nice thing to do

11. Switch off the phone in the usual way, and then hold down [Volume UP] + [menu] + [Power] to switch it back on.
You should now be booted into your nice new touch recovery.

12. Touch the screen and enjoy. “reboot system now” to exit

Categories: SGS3 GT-I9300 Tags: , , ,