BBC's Fast Track program this week had some interesting information.

While airlines are preparing to allow mobile phones on aircraft by 2006, some
hotels have seen revenus from land line phone drop by as much as 70% in recent
years since customers now use their own mobile phones instead of paying
exhorbitant hotel rates.

It is now feared that hotels will start installing mobile jammers so that
guests will revert to using the landline phones and thus re-establish those
now lost revenus.

As well, Fast Track compared current airline phone costs. Emirates is the
creapest at USD$5.00 pr minute, next is Singapore at $5.90. Most others are at
the $9.00 per minuta range (I assume these are for satellite calls that work
over oceans, as opposed to the domestic land based systems available in north america).