Mobile phone interference

["oatcruncher" oatcruncher]

Has anyone experienced intermittent interference on their recordings, 
that can be attributed to carrying a mobile phone switched on please? I 
have had a few instances of interference on my new LS-10, and am 
wondering if my mobile is the cause. There appears to be no set pattern 
to it, and fortunately it hasn't happened in the middle of something 
important yet. It's probably relevant to state that I have been hand 
holding my recorder in all instances. It occurs to me that a sample of 
what I mean would possibly be helpful, I will post one shortly.
I have worn hearing aids for some years, and have experienced similar 
interference sounds in the past while using the old analogue aids. This 
would happen when near to a landline handset that was about to ring.
Max