The problem is that these SIMs are provided by Docomo without a specific component that Android expects. This causes the phone to appear to not have a data connection at all (when it actually does), resulting in excessive battery drain as power to the radio is boosted while searching for a signal.
While the problem has finally been addressed in the Android source code, this will most likely only help for tablets that have no built-in phone capability. A normal Android phone with a data-only SIM provided by Docomo will most likely still not show signal bars. The previous fix required a fair bit of work. The new fix uses a simple Xposed module, so it can be performed entirely on the phone and can be easily disabled when you use a voice SIM.
If you read Japanese, visit oov's blog for a more detailed explanation.
|Xposed Installer with oov's signal bars module installed and enabled.|
- Android 4.03 - 4.3
- Xposed Installer (apk)
- Docomo Sim Patcher (Xposed module; apk)
- Download and install the most recent version of the Xposed installer. The current version at the time of writing is
- Launch the Xposed installed and tap "Install/Update".
- Reboot the phone
- Download and install the Docomo Sim Patcher module. The current version is
- From the Xposed Installed tap the modules tab and enable the Sim Patcher module by tapping the checkbox.
- Reboot the phone.
I'd been running a very old beta of unofficial Cyanogen 10 on a Nexus S for about a year now. It was really out of date and buggy, but patching a freshly installed ROM was just a pain. You had to pull the framework.jar file to a computer, decompile it, patch it, recompile it, push it back, and hope everything worked. The previous batch file wasn't really usable because of a bug with virtual box and the Nexus S, and I never got around to making a batch shell script, so I had to do it all manually, which meant that I just never did it.
|Flashing the latest CM based off 4.2.2 from the teamw.in recovery, which is really full of win|
|HSPA and signal bars!|