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    <p>I should have read the documentation for <code>logcat</code> before I started hunting through source. According to <code>logcat</code>'s documentation:</p> <blockquote> <p>The Android logging system keeps multiple circular buffers for log messages, and not all of the log messages are sent to the default circular buffer.</p> </blockquote> <p>Messages with a tag of <code>SMS</code> are sent to the radio buffer, not the main buffer. Hence you won't see them unless you go out of your way to do so. If you run the command:</p> <blockquote> <p><code>adb logcat -b radio</code></p> </blockquote> <p>you should see your missing log messages. The above information can be found in <a href="https://developer.android.com/tools/debugging/debugging-log.html" rel="nofollow">https://developer.android.com/tools/debugging/debugging-log.html</a>.</p> <hr> <p>Now, for those of you interested in code spelunking, below is my original answer:</p> <p>The methods in the <code>Log</code> class are all wrappers around <code>println_native</code> which is a JNI method.<br> <code>println_native</code> performs some validation of its parameters and then calls <code>__android_log_buf_write</code>.</p> <p>Now this latter method compares the tag parameter (from the original <code>Log.d</code> call) against several hard-coded strings (with the tag <em>SMS</em> being one of this list) and if it finds a match, winds up writing the log message to a different file!</p> <p>By the way, other tags that get rerouted are GSM, STK, PHONE, CDMA, and a few others.</p> <p>Relevant source can be read in </p> <ul> <li><p><a href="http://www.java2s.com/Open-Source/Android/android-core/platform-frameworks-base/android/util/Log.java.htm" rel="nofollow">http://www.java2s.com/Open-Source/Android/android-core/platform-frameworks-base/android/util/Log.java.htm</a></p></li> <li><p><a href="https://pdroid.googlecode.com/svn/android-2.3.4_r1/trunk/frameworks/base/core/jni/android_util_Log.cpp" rel="nofollow">https://pdroid.googlecode.com/svn/android-2.3.4_r1/trunk/frameworks/base/core/jni/android_util_Log.cpp</a></p></li> <li><p><a href="https://in-the-box.googlecode.com/svn-history/r4/trunk/InTheBoxSim/liblog/logd_write.c" rel="nofollow">https://in-the-box.googlecode.com/svn-history/r4/trunk/InTheBoxSim/liblog/logd_write.c</a></p></li> <li><p><a href="http://www.takatan.net/lxr/source/drivers/staging/android/logger.h#L33" rel="nofollow">http://www.takatan.net/lxr/source/drivers/staging/android/logger.h#L33</a> </p></li> </ul> <p>These aren't the official links and may disappear at some point. I'll try and track down the official links and edit this later this evening.</p>
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    1. USMatthew Burke
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    1. COGood stuff - in your hunting, have you found a formal (or even semi formal) list of which tags get pushed to the radio and events logs as opposed to the main (default) log? I particularly liked the line `/* XXX: This needs to go! */` in source for logd_write.c - other than that piece of code is this documented anywhere?
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      1. USNeil Townsend
    2. COThe only thing I've seen are the hard-coded strings in the source code for logd_write.c.
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    3. COI've edited the answer to include the list of tags from the source code - could you check that they look correct to you?
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