On Mar 7, 3:45 pm, "309" wrote:

I've been told that BlackBerry's are notorious for this
interference.
Can one "phone"(/device) interfere with another in this manner?

I don't know enough about BlackBerries to comment.

One might extend this conversation to the thousands of PDA's that are
semi-permanent (and unapproved?) additions to glider instrument panels
(yes, I plead guilty as charged). But perhaps only if they have
wireless (e.g. BlueTooth) capability?

Bluetooth's tx power is suitable for a few yards only, and so can
be much lower power. This would reduce the probability of
interference
causing problems.

Personally I'd ensure any non-essential radio is completely off
before I'm airborne.

Practical testing is always useful, provided one realises that
testing can only demonstrate problems, not prove the absence
of problems.