Do you mean OEM car phone and GPS or standalone aftermarket items, if latter then it's most likely that you have heat reflecting window glass. I had all windows like that in mine and aftermarket GPS would not get any signal in car, did not notice any issues with phone. I since have replaced front windscreen with regular as it had lot of small chips and scratches and I sourced new one cheaply. Since then there are no problems with GPS reception. Changing solar sunroof for glass might improve it but I don't know by how much. In my opinion solar sunroof is one of the best features (after V8) and I would never change it for regular glass.
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Currently 8less
2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D
8 history:
2006 A8 Sport 4.2TDI quattro SOLD,
1997 S8, reached end of life with gearbox failure
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