Depends on the Phone type.
Ive had GSM Phones caused bad ( Oh **** turn that off NOW) static on VHF radio's in, Tobago's, C210, C182 & C172's. CDMA phone dont have any noise whatsoever on C210, C310, PA31.
Wasnt there a report out not long ago that said that these problems had only been found in Boeing- No reports of interferance problems in Airbus????