What does it mean if a phone constantly goes to voicemail, and is lycamobile service down?

Shannon18
Tried calling a friend. Goes to voicemail for last few days. Doesn't even ring or anything :/ is lycamobile a good network. Or could it be signal. We didn't fall out or anything either. :)
What does it mean if a phone constantly goes to voicemail, and is lycamobile service down?
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