Lumia 635 not receiving incoming calls

lumia635

    I have tested this problem using the standard cellular calling and with Wi-Fi calling. The issue is that incoming calls are ringing for the caller, but not ringing on my phone. My phone can have 4 bars signal strength, but the call still does not go through. The strange thing is that once I make an outgoing call, I can receive incoming calls for a while. After an hour or two, I cannot receive incoming calls again. I have not changed any voicemail settings, and there have been no T-Mobile updates to the Lumia 635, ever. This has worked fine for years, and just started within the last month or two. Any ideas?

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