Ordinarily we wipe the data of apps we are restoring. This is problematic for packages that expect that their data can never be wiped back to nothing, especially system packages, so we now respect the android:allowClearUserData manifest attribute.
Added info about mcc and mnc, plus other changes per http://b/1918247; rewrote "How Android find best match" section per rgreenwalt's comments and added flowchart.
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