Possible Clues:

• Ring twice
• 'Automatic' telephone feature
• Engineers put back -- try to call again
• Call again from tunnel going all the way back around central Sweden
• Phone function
• Call again to revolutionary ¿ his heart is set on gangster
• Button on a home phone that saved you some number punching
• In retrospect, left to give a hand in hospital in Ring, again
• ''Call again'' phone feature
• Right deal I arranged for phone again