Do you have a monitored security system ?
We had this happen recently and found it was notifying base that the backup battery was low and needed replacing, sometimes twice every day !!

On 12/09/2006, at 10:37 AM, Severin Crisp wrote:

I have a really strange one which I am sure has a simple explanation. My recent phone bill has come up with a rash of 1300 calls, more than the rest of my calls in total number (but not cost). Investigation shows that they are all short calls to the same number and daily at 2.36am. The number is 1300 303 494 and dialling it brings up a modem. All the evidence screams computer to me. At that time my G5 is on but fully asleep, from Sleep in the Apple menu. I am on broadband so Intego, Software update and anything else should not initiate a phone call. My G5 does not have a modem though I share the modem in my wife's G3 iMac via ethernet router for sending faxes. At the this time of night her iMac is always shut down.
Any suggestions?
Severin Crisp
________________________________________________________

                    Assoc Professor R Severin Crisp, FIP, CPhys, FAIP
       15 Thomas St, Mount Clarence, Albany, 6330, Western Australia.
                      Phone  (08) 9842 1950   (Int'l +61 8 9842 1950)
                             email  mailto:[EMAIL PROTECTED]
                            Web pages http://www.JennyCrisp.com.au
                               &  http://members.westnet.com.au/Crisp
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Regards,
Stephen Chape