Pax Vobiscum,
You are quite right in noting that no mobile phone is mentioned in the report, but that is missing the point completely. Whether the missed/not understood radio call, that ultimately led to the accident, was due to poor language skills, tiredness or mobile phone interference mattered not for the outcome.
It is a clear example of what on the surface might look like an insignificant and trivial matter leading to a serious accident. Passengers who leave their phones on, either mistakenly or deliberately, have no means of quantifying the risks and it appears that for most passengers the only frame of reference on whether something is safe or not is whether the aircraft crashed or not.
The reality is that it is a much more complex matter.