I have read some older posts about interfernce from various cell
phones coming through speakers of all kinds.  In my area in northern
Maine, this has only started in the last month.  Theres a noise that
emits from the speakers like dadada dadada dadada randomly throughout
the day wether Im home or at work.  Seems anywhere there are speakers
and cell phones.
Most people have said upgrade your speakers or get a better cell phone
or simply keep the cell phone away from speakers.  Thats a great fix
if you like band aids but since this has been going on all over the
globe for a long time now, theres more concern especially if you are
in the audio business.
Doesnt the FCC regulate this kind of thing?