[Merge] lp:~tiagosh/telephony-service/voicemail-dualsim into lp:telephony-service

[Bill Filler]

Review: Needs Fixing

I only have one sim installed on the dual sim phone and I'm seeing the label "Voicemail - Sim 1". It shouldn't display the sim name if only one is active.
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https://code.launchpad.net/~tiagosh/telephony-service/voicemail-dualsim/+merge/234840
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