It used to be said that Colman’s Mustard made their money not from the mustard that people consumed, but from what they took from the jar and left on the side of their plate. After a few months of using a Samsung Galaxy Ace, I’m beginning to think that the makers of some mobile phones work in a rather similar way. If I get an answerphone message because I miss a call, I have to ring up and collect it. I try to keep such calls short by knowing which keypad numbers play and delete messages and typing them as soon as I can. But there’s often an awkward gap at the end, especially if my phone has locked itself in the meantime, so I must type a password and then ‘pull down’ a special screen to end the call.