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Was having same problem in my 2006 330i. Both the phone and assist icons had gone to "--". I have a pre-wired system with no iDrive.
I went to the fuse box, pulled fuse #17 (5 amp) and reinserted it. It worked again after that. Seemed like some of the fuses were a bit loose, so I pushed them back in. According to my diagram, there are three fuses associated with the phone system, but may be different for non-US models.
Hope this helps, mine ended up being an easy fix. Hopefully it will last...
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