I'm not getting my voicemails until hours or days later on my iPhone 7. Can someone

When someone calls me on my iPhone 7, it rings like it should, but if they leave a voicemail, I don't get the voicemail until hours or days later. I have T-Mobile. Is this a device issue or a carrier issue? And how can I fix it?

Hm

This is a very common glitch. I have had people get offended when I do not return their call, and I'm thinking "What call?" Has to do with digital traffic.

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