NumberResearchThousands-blocks in 307-388
This prefix’s ten 1,000-number blocks and who holds each — 10 on record · from the daily NANPA thousands-block report, 09/20/2026
The ten 1,000-number thousand-blocks inside prefix 307-388 and who was initially assigned each. Under pooling these blocks often belong to different carriers — the single prefix-level “assignee” is usually just the pool / code holder, not who holds the numbers. ← all 307 blocks
Most active assignees, all time — NPA 307
New assignments by month
Sep 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| — | 307-388-0XXX | 0000–0999 | Reserved | NEW CINGULAR WIRELESS PCS, LLC | 6010 | WORLAND | WY |
| 2025-04-09 | 307-388-1XXX | 1000–1999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | WORLAND | WY |
| — | 307-388-2XXX | 2000–2999 | Reserved | NEW CINGULAR WIRELESS PCS, LLC | 6010 | WORLAND | WY |
| 2025-06-20 | 307-388-3XXX | 3000–3999 | Assigned | TERRA NOVA TELECOM INC. | 145J | WORLAND | WY |
| — | 307-388-4XXX | 4000–4999 | Reserved | NEW CINGULAR WIRELESS PCS, LLC | 6010 | WORLAND | WY |
| 2026-02-20 | 307-388-5XXX | 5000–5999 | Assigned | TERRA NOVA TELECOM INC. | 145J | WORLAND | WY |
| 2015-10-29 | 307-388-6XXX | 6000–6999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | WORLAND | WY |
| 2021-02-23 | 307-388-7XXX | 7000–7999 | Assigned | TELEPORT COMMUNICATIONS AMERICA WY-LLC | 879G | WORLAND | WY |
| 2018-04-11 | 307-388-8XXX | 8000–8999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WY | 6566 | WORLAND | WY |
| 2014-09-12 | 307-388-9XXX | 9000–9999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WY | 6566 | WORLAND | WY |
Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.