With due respect Entaxei is this not an urban myth? There is a thread on airliners.net (Mobile Phone Use And Accidents — Civil Aviation Forum | Airliners.net) that is seeking to find any aircraft accident that was a result of use of cell phones.
No, it's not a myth.
If one has a gunfight and ten thousand rounds of ammunition are expended but only six people die, does that mean that the ammunition is harmless? What if nobody dies? Does that mean that bullets hurting people is a myth? Of course not.
Likewise, if one hasn't recorded a mishap based on cell usage, does this mean that simply because an airplane hasn't crashed or nobody has died, that the reasons for restricting cell (and other electronic devices) use in flight is a myth? Of course not.
While a thread on PPRUNE may not link to a mishap, rest assured that databases such as the NASA ASRS reporting system have a significant number of PED (personal electronic device) related incidents.
It's not just cell phones.