You may (or may not) have seen this report / study by the UK CAA titled:
Interference Levels In Aircraft at Radio Frequencies used by Portable Telephones, found here:
http://www.caa.co.uk/docs/389/srg_ac...-01-030303.pdf
A 1 page summary of that study (amongst other things) is found here:
http://www.casa.gov.au/fsa/2003/sep/33.pdf
The short answer is, yes, mobile phone emissions cause intereference / anomalies.