For exrta security just dial "0" and ask your operator.  Ok now for the list
 This is a list of phone number prefixes.  Basically, any number that matches
 the first three numbers of those listed, you can call from Livermore as a 
 local call...     
  
                Here they are:

224- Pleasanton            551- Dublin, San Ramon
248- Dublin, San Ramon     606- Livermore
275- Bishop Ranch          734- Pleasanton
277- Bishop Ranch          735- Bishop Ranch               
294- Livermore             803- Dublin, San Ramon
373- Livermore             823- Bishop Ranch
416- Pleasanton            828- Dublin, San Ramon   
417- Pleasanton            829- Dublin, San Ramon
422- Livermore             833- Dublin, San Ramon
423- Livermore             830- Bishop Ranch
426- Pleasanton            842- Bishop Ranch  
443- Livermore             846- Pleasanton
447- Livermore             847- Pleasanton
449- Livermore             866- Bishop Ranch
455- Livermore             867- Bishop Ranch
460- Pleasanton            901- Bishop Ranch
462- Pleasanton
463- Pleasanton
484- Pleasanton