T-MOBILE USA, INC.
169 prefixes in 773 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 773-701 | CHICGOZN10 | 6529 | 2005-09-30 | Yes |
| 773-704 | CHICGOZN03 | 6529 | 2002-01-23 | — |
| 773-715 | CHICGOZN06 | 6529 | 2002-10-16 | Yes |
| 773-716 | CHICGOZN01 | 6529 | — | Yes |
| 773-719 | CHICGOZN01 | 6529 | — | — |
| 773-727 | CHICGOZN10 | 6529 | 2002-10-16 | Yes |
| 773-732 | CHICGOZN03 | 6529 | — | — |
| 773-738 | CHICGOZN03 | 6529 | 2007-08-29 | Yes |
| 773-739 | CHICGOZN02 | 6529 | — | Yes |
| 773-742 | CHICGOZN03 | 6529 | 2001-11-05 | — |
| 773-744 | CHICGOZN06 | 6529 | 2001-08-30 | — |
| 773-746 | CHICGOZN03 | 6529 | — | Yes |
| 773-747 | CHICGOZN04 | 6529 | 2008-01-07 | Yes |
| 773-749 | CHICGOZN03 | 6529 | 2007-06-19 | Yes |
| 773-759 | CHICGOZN03 | 6529 | 2002-05-21 | Yes |
| 773-780 | CHICGOZN08 | 6529 | — | Yes |
| 773-793 | CHICGOZN03 | 6529 | — | Yes |
| 773-803 | CHICGOZN03 | 6529 | 2007-03-15 | Yes |
| 773-807 | CHICGOZN02 | 6529 | 2002-08-15 | — |
| 773-808 | CHICGOZN07 | 6529 | — | Yes |
| 773-809 | CHICGOZN03 | 6529 | 2008-09-08 | Yes |
| 773-814 | CHICGOZN03 | 6529 | 2002-07-22 | — |
| 773-816 | CHICGOZN10 | 6529 | 2005-03-28 | Yes |
| 773-817 | CHICGOZN03 | 6529 | 2002-10-16 | — |
| 773-818 | CHICGOZN01 | 6529 | — | — |
| 773-822 | CHICGOZN06 | 6529 | — | Yes |
| 773-827 | CHICGOZN06 | 6529 | — | Yes |
| 773-837 | CHICGOZN04 | 6529 | 2001-08-08 | — |
| 773-842 | CHICGOZN01 | 6529 | 2001-04-19 | Yes |
| 773-851 | CHICGOZN07 | 6529 | 2001-03-09 | Yes |
| 773-853 | CHICGOZN03 | 6529 | 2006-10-03 | Yes |
| 773-858 | CHICGOZN02 | 6529 | 2001-07-06 | Yes |
| 773-865 | CHICGOZN02 | 6529 | 2001-08-30 | — |
| 773-875 | CHICGOZN08 | 6529 | 2001-09-06 | — |
| 773-877 | CHICGOZN03 | 6529 | 2006-07-21 | Yes |
| 773-879 | CHICGOZN01 | 6529 | — | Yes |
| 773-885 | CHICGOZN03 | 6529 | 2005-03-08 | Yes |
| 773-886 | CHICGOZN07 | 6529 | 2007-10-31 | Yes |
| 773-895 | CHICGOZN01 | 6529 | 2001-08-30 | — |
| 773-908 | CHICGOZN01 | 6529 | — | — |
| 773-916 | CHICGOZN06 | 6529 | 2010-08-31 | Yes |
| 773-930 | CHICGOZN03 | 6529 | 2007-01-08 | Yes |
| 773-931 | CHICGOZN10 | 6529 | 2001-05-23 | — |
| 773-934 | CHICGOZN03 | 6529 | 2002-08-21 | — |
| 773-936 | CHICGOZN07 | 6529 | 2001-08-30 | — |
| 773-939 | CHICGOZN08 | 6529 | 2007-02-21 | Yes |
| 773-941 | CHICGOZN10 | 6529 | 2007-11-27 | Yes |
| 773-943 | CHICGOZN02 | 6529 | 2010-09-03 | Yes |
| 773-949 | CHICGOZN03 | 6529 | 2011-02-24 | Yes |
| 773-952 | CHICGOZN07 | 6529 | 2007-06-14 | Yes |
| 773-953 | CHICGOZN03 | 6529 | 2007-08-29 | Yes |
| 773-954 | CHICGOZN10 | 6529 | 2005-09-30 | Yes |
| 773-956 | CHICGOZN06 | 6529 | 2008-09-04 | Yes |
| 773-960 | CHICGOZN03 | 6529 | — | Yes |
| 773-963 | CHICGOZN03 | 6529 | 2007-07-17 | Yes |
| 773-964 | CHICGOZN10 | 6529 | 2007-08-21 | Yes |
| 773-968 | CHICGOZN03 | 6529 | 2001-02-12 | — |
| 773-969 | CHICGOZN04 | 6529 | 2008-01-07 | Yes |
| 773-971 | CHICGOZN10 | 6529 | 2007-07-11 | Yes |
| 773-979 | CHICGOZN10 | 6529 | 2006-06-08 | Yes |
| 773-982 | CHICGOZN10 | 6529 | 2008-02-29 | Yes |
| 773-983 | CHICGOZN10 | 6529 | 2002-03-28 | — |
| 773-984 | CHICGOZN03 | 6529 | 2007-03-15 | Yes |
| 773-986 | CHICGOZN08 | 6529 | 2007-10-16 | Yes |
| 773-988 | CHICGOZN01 | 6529 | — | — |
| 773-991 | CHICGOZN03 | 6529 | — | Yes |
| 773-993 | CHICGOZN03 | 6529 | 2011-02-18 | Yes |
| 773-996 | CHICGOZN08 | 6529 | 2007-10-16 | Yes |
| 773-997 | CHICGOZN02 | 6529 | 2008-10-28 | Yes |
These are initial assignees from NANPA CO-code records — because of number portability, the current serving carrier of individual numbers may differ. Bulk export requires a membership.