[Samsung Galaxy Nexus] autobulb:
Greetings all, I just wanted to post my experience with the **** Docomo app.

So, some background information first. I am running a Docomo Galaxy Nexus which I purchased used from an electronics shop in Japan. The IMEI was not a generic one, and the device was stock so as far as I know it was previously used by a regular user and not altered in any significant way.

So, I was using the b-mobile network in Japan which runs on the Docomo network. So even phones that are simlocked to Docomo work on b-mobile. However, in a few days I am traveling back home to the US for a week so I wanted to use T-mobile without buying or renting a phone so I decided to try the **** Docomo app since I have heard about it before.

So, I was running CM11 nightlies on my phone and decided to try out the app despite it being designed for 4.0.4. The app installed, and seemed to work, however after it's two reboots it still was locked. I was using a friend's Softbank SIM in order to test another network. Naturally I figured the Android version was the problem, so according to posts in this thread I saw that 4.0.4 was the supported version and had success so I did a factory restore back to yakju (without Google wallet), rooted, and installed the **** Docomo 3.1.apk which I found a link to on a blog since the ones posted in this thread give 404 errors. It said it was installed and unlocked, but it did not automatically reboot like it was supposed to. I rebooted manually, and the "SIM Locked" screen that you get when you have a non-supported SIM was gone. I checked my IMEI number in settings and unfortunately it was changed to the generic one. So, I restored the IMEI using the app, rebooted and was back to my original. One thing I noticed is that after the second reboot the **** Docomo app would always crash upon reboot. I figured this was part of the problem. I tried uninstalling and reinstalling the app and retrying but had the same results: seemingly unlocked but with a generic IMEI.

Finally, I decided to try flashing to the Google stock takju, which has Google wallet installed. I rooted again (using a different root method using the Unified Android Toolkit), installed the APK and did the unlock procedure. This time, it rebooted on its own twice, like it's supposed to and the SIM lock screen was gone, but this time my IMEI was unchanged. Seems to have succeeded, but when I am using the Softbank SIM card it doesn't seem to connect and my wireless bar signal is at 0. After the second reboot the **** Docomo app would always crash upon reboot as well.

I don't know if this is a problem with my Softbank SIM since it has been out of use for over a year. So, since I had the same IMEI as stock, I decided to save the backup folder than **** Docomo creates to my hard drive and install CM again. This time I went to CM10.2 since 11 was a little buggy. My bmobile SIM works fine, and putting the Softbank SIM back shows "Softbank" as the carrier but doesn't give me a signal.

So, the end result? I'm not 100% sure it's unlocked until I can test out a non-Docomo SIM I know is current and working. But at least I was able to retain my IMEI and get rid of the "SIM locked" screen which makes it seem like a success. I will find out the true result in 2-3 days when I arrive back home and purchase a T-mobile SIM.

Good luck guys.