What is getVoiceMailAlphaTag() for?

I saw the method TelephonyManager.getVoiceM开发者_如何转开发ailAlphaTag() but I have no idea what it's for. The javadocs are useless.

In situations like this it always helps to Use the source® - IMHO this is a HUGE advantage of Android over other platforms.

On GSM phones this gets down to SIMRecords.

Apparently (after some googling) alpha tag for voicemail is a name that your mobile operator uses for voicemail. If not set it defaults to "Voicemail" in english

This data (voicemail alpha tag & voicemail number) is stored inside SIM and is usually set by your operator.