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Enable use of phone accounts for voicemail info display.
Call the "isVoicemailNumber(subId, number)" method instead of the one with just the number. This is because we need to check whether a number is the voicemail number for a specific phone account, otherwise the UI would never correctly display "voicemail" for the non-default SIM. Bug:17925501 Change-Id: If1d6cb1acfcb570aca5e639858af8804bac202c0