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Artemis opened an audio manipulation program on his Powerbook and set about cutting and pasting his mother's words from the recorded phone call. When he had selected the words he wanted, and put them in the right order, he smoothed the levels 
to make the speech sound natural.
When Principal Guiney turned on his mobile phone after the visit to Munich 's Olympia Stadium, there would be a new message waiting for him. It would be from Angeline Fowl, and she would not be in a good mood.
Artemis routed the call through Fowl Manor, then sent the edited sound file by infrared to his own mobile phone.
'Principal Guiney.“ The voice was unmistakably Angeline Fowl's, and the caller ID would confirm it. ”I'm worried about Arty. He has a dose of food poisoning. His outlook is marvelous and he never complains, but we want him home with us. You understand. I put Arty on a plane home. I am surprised he got a dose of food poisoning under your care. We will talk more on your return.“
That took care of school for a few days. The dark half of Artemis felt an electric thrill at the subterfuge, but his growing conscience felt a tug of guilt at using his mother's voice to weave his web of lies.
He banished the guilt. It was a harmless lie.

The Opal Deception, Chapter 4