Any problems in my company, the customer is always right, I never question them, even if I know it's a problem on there computer

I mean from mobiles at the moment the data costs outweigh the savings on the telephone call.
Depends on your contract. In my case I get plenty of spare data transfer on my PDA2K, and if you are abroad, it can save you a fortune. If you call from Singapore it costs 0.012p/min, instead of the mobiles £1.50/min