577 Area Code
Personal communications services
The 577 area code is reserved for special services (Non-Geographic Services). Numbers in it are used for personal communications services in the 5YY non-geographic pool.
How 577 is used
Numbers in 577 are used for personal communications services such as one-number follow-me forwarding. The called party (the subscriber) pays for the call while the calling party is billed at standard long-distance rates. All 5YY codes share the same purpose and pool of central-office assignments.
- Purpose
- Personal communications services
- Assignee
- NANPA on behalf of the FCC
- Dialed as
- 1-577-NXX-XXXX
History
Creation: Area code 577 was placed into service on March 28, 2014 as the fifth 5YY non-geographic NPA, relieving 566. It had been reserved by the Industry Numbering Committee in the 1990s alongside 588 and 522 as a future PCS relief code. By the mid-2010s the 5YY pool was being drawn at roughly one new code every 18-24 months.
Relieved: Area code 577 was activated to relieve 566.
Mnemonics: The digits 577 map to letter combinations on the standard telephone keypad, yielding 48 possible three-letter mnemonics. Prior to 1995, the middle digit of area codes was restricted to 0 or 1 — codes created before then cannot form mnemonics.
Sources: en.wikipedia.org/wiki/Personal_communications_service_(NANP).
Other special-use area codes
Same-category codes first, then the rest of the NANP special-use portfolio.
Frequently Asked Questions
What is area code 577 used for?
577 is a special-use area code in the North American Numbering Plan. The 577 area code is reserved for special services (Non-Geographic Services). Numbers in it are used for personal communications services in the 5YY non-geographic pool.
How is 577 dialed?
Numbers in 577 are dialed as a full ten-digit number (1-577-NXX-XXXX). It is a non-geographic area code, so 1-577 numbers are not tied to any city or state.
Who assigns 577 numbers?
NANPA on behalf of the FCC
What did 577 relieve or replace?
Area code 577 was activated to relieve 566 as that pool of numbers neared exhaustion.
When did area code 577 go into service?
Area code 577 was placed into service on March 28, 2014. It was the 5th 5YY non-geographic area code.