6uv1 or 6uv2 number not in service

Hello. My friend has a Blackberry and I've been trying to call her, but when I do a message comes on and says 6uv1 (or 6uv2) this number is not in service. And it has been like this for over a week. We have been talking just before that, and she never mentioned about changing her number. When I first called, it said 6uv2, then when I called later it said 6uv1, and now it says 6uv2 again. I have no other way of getting in contact with her. Do anyone know what this means? I really appreciate it.
Thanks!

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Hi,

I got the same message when I tried to reach my own phone. It's because the line was disconnected for an overdue payment... probably the same deal with your friend.