<unk>  is a special abbreviated telephone number reserved in the North American Numbering Plan (NANP) as an easy-to-remember three-digit code to reach information and referral services to health, human, and social service organizations. Like the emergency telephone number<unk> ,<unk>  is one of the eight N11 codes of the North American Numbering Plan (NANP).
2-1-1
9-1-1
7+3 
D50 
10/90 gap
J147
PCA3
211th 