I am having the exact same problem with my Galaxy J3 Straight talk phone. When I first got it, there was a little symbol in the upper left corner, indicating a voicemail. That stopped showing up and I began getting a strange text, numerals only, starting with a 9. I finally realized when one of these appeared, it meant I had a voice mail, okay, now I know. Then even these stopped appearing. Like you, the only way to know is to periodically just check my voice mail. Today I found I had 6 new ones in the last week. There is no voice mail app in notifications, so I can't turn it on. WTH is with these phones or provider?
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