''WHATEVER YOU DO hang on to the phone. . . . . . . . ! . . . . . . . . ! Feel the smoothness of its bevelled screen . . . . . . . . ! . . . . . . . . ! Place your thumb in the soft depression of its belly-button - turn it over and over. . . . . . . . ! . . . . . . . . ! A five hundred-quid worry bead - and all I worry about is losing the bloody thing. . . . . . . . ! . . . . . . . . !''For the four characters at the heart of Will Self''s brilliantly acute novel of our times the five hundred-quid worry bead in their pocket may be both a blessing and a curseFor elderly Dr Zachary Busner it is a mysterious object - ''NO CALLER ID - How should this be interpreted? Is it that the caller is devoid of an identity due to some psychological or physical trauma?'' - but also it''s his life line to his autistic grandson Ben, whose own connection with technology is, in turn, a vital one.For Jonathan De''Ath , aka ''the Butcher'', MI6 agent, the phone may reveal his best kept secret of all: that Co