Hi all - yes, you're all absolutely right, but I don't think I've been clear. I always, as a matter of course, have my phone or airplane mode. The problem is that I'm picking up signals from other people's phones within about 5 metres, so on any functions or gigs I always have to get people to turn their phones off - and sometimes it's not possible, practical or polite to doublecheck everybody! The thing is, it seems my Sadowsky is FAR worse than ANY other bass I've had at picking up this signal - none of my other basses are remotely as bad. And the problem is that it's by far my favourite bass, and I don't want to sell it