Android APN type codes

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http://forum.xda-developers.com – I spent most of a day trying to get an APN definition for MMS working on my new (and first) smartphone. Searching for answers, I found a lot of conflicting information regarding the meaning and specification of "APN type." I finally decided to go to the source (code) to understand. Here's what I found for Android 4.1.1 (sorry if this is duplicative, but nowhere could I find an exhaustive list): from /android/4.1.1/frameworks/base/telephony/java/com/android/internal/telephony/Phone.java, /android/4.1.1/frameworks/base/telephony/java/com/android/internal/telephony/DataConnectionT (HowTos)