I propose a new service for the gadget-hungry customers of the mobile generation. It is no longer enough to entertain other passengers by playing all the ring-tones available on your phone. Why not include sound-effects in the phone call itself.
These effects could be provided by the handset or
by in-line filtering of the call by the phone service provider. I believe that this would provide a 'richer' experience for callers and lead to a whole range of spin-off services.
Naturally, sounds could be added, to provide alibis or excuses. e.g. -
"I won't be in today {sound of vigourous retching, followed by damp squelching noise}"
"I can't hear you, I'm getting a lot of static..."
"I can't talk now we're under heavy bombardment..."
An alternative would be to provide sophisticated filtering.
> "Who is that with you Darling? Can I hear female voices?"
{caller clicks button to engage call filtering}
< "Nope, I'm here in the hotel room on my own..."
< faint noise heard in background - "Baaa.."
< "Damn!"