No Mandatory date set for 1 +10 digit dialing in Chicago NPA 847/224 Overlay; update to PL-127
Primary documents
| Letter | Published | Subject |
|---|---|---|
| PL-157 | 1999-02-23 | No Mandatory date set for 1 +10 digit dialing in Chicago NPA 847/224 Overlay; update to PL-127 |
All documents are official NANPA planning letters (Tier A sources). This page consolidates every letter we have on record for this event; it is updated automatically when new letters are detected, with sensitive changes held for editorial review first.