"Confessions over the telephone are forbidden, because there is a chance the telephones are monitored and the confessions will reach state security," the independent Al-Masri Al-Yom quoted Pope Shenuda III as saying.
The leader of the Coptic minority also said confessions over the Internet were invalid because they might be read by websurfers.
"A confession over the Internet does not count as a confession, because everybody can look at it and it won't be secret," he said.
The sacrament of confession, also practiced by Roman Catholic and Eastern Orthodox Christians, is normally a very private conversation between penitent and priest.
Priests are strictly bound to respect the privacy of confession, even in the face of threatened punishment, and many countries' legal systems specifically protect the "seal of the confessional."
Unlike Roman Catholic confessions, Coptic confessions are done face to face.
Coptic Patriarch Anba Morcos told AFP that people have begun to phone in their confessions.
"It's a new thing; it's been happening for the past four or five years," he said.
Morcos added that Pope Shenuda has also banned monks in Coptic monasteries from using cell phones.
"The monk is supposed to be secluded from the world. But the mobile phone brings the world to him," he said, adding that monastery administrators were allowed to keep their cell phones.
The Vatican does not recognise confessions by telephone or over the Internet.
Archbishop John Foley, president of the Pontifical Council for Social Communications, has said "confession requires the physical presence of the priest and the penitent.
"Privacy is absolutely not guaranteed on Internet, and there is no certainty as to the identity of the two parties to the communication. You can't have confession by e-mail, any more than you can have it by telephone or letter."
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