Annoying Calls at same time almost daily

My Mother has cingular and she tells me she gets an annoying cell call at least two times a week at the same time each day (usually 3pm). She has an older phone and it doesn't show the number the call is from. What causes this and where does she start to redemy this problem ?

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I guess nobody has ever encountered this problem . Anybody ? There's got to be somebody.

It happened to me...of course, the number never showed, but the calls were more frequent. I ended up getting another number.

HEY! I've been getting strange calls too!!! I thought it was only me.

It's always around noontime, I get a "private call" or "+00018" displayed on my caller ID! When I pick up, I hear ringing (as if I'm calling someone), so I hang up. I tried answering it so I could find out who's calling me, but all I hear is silence..

THIS IS WEIRD. Is it just a Cingular thing? Are they selling our numbers????

Tell het to look at her bill...
Also she can ignore it and not read her voicemail.
Alos she can block the call... or can she?

sometimes that happens to me too. is there a way to block calls?