Check the settings for your outlook account to see if you have it auto delete emails.
Have you looked Google Fit application?
An unlocked unbranded device isn't compatible with the Verizon Wireless Visual Voicemail feature and application. The small tape reel symbol in the notification bar is for the basic non-visual voicemail and is the only way to notify you have a new voicemail. If you pull down the notification shade there should be a larger notification for voicemail that can't be removed until you listen to the voicemail.
I'm most definitely NOT a VZW employee. If a post answered your question, please mark it as the answer.