Hi.
Do a firmware update. This phone uses FOTA technology that allows doing the firmware update straight on the phone, downloading firmware directly from Nokia server.
To do the update:
Select Menu > Settings > Phone > Phone updates
Try also replacing the SIM card for a while to test if problem was SIM card. A defective SIM can cause similar problems.
If that does not work, try:
Select Menu > Settings > Rest. factory sett.
That will reset phone to factory, data and addresses won't be deleted.
Here manuals.
Nokia 8800 Arte User GuideDownload - Nokia 8800 User Guide
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