Few writers will have toasted the mobile phone on its 40th birthday this week, and the Nobel and Booker prize winner JM Coetzee certainly didn't. "You say you are quite prepared to write novels in which people go around with personal electronic devices in their pockets," he writes to Paul Auster in Here and Now, a forthcoming collection of their letters. "I must say I am not. The telephone is about as far as I will go in a book, and then reluctantly. If people ("characters") are continually going to be speaking to one another at a distance, then a whole gamut of interpersonal signs and signals, verbal and non-verbal, voluntary and involuntary, has to be given up. Dialogue ... just isn't possible."