OCN 0521 · Incumbent Local Exchange Carrier
Fort Mill Telephone Company
d/b/a Comporium Communications
Part of the Comporium Communications group — 4 OCNs across 2 states · 93 blocks combined.
Holding: Comporium Inc
Total blocks
16
Recent (18 mo)
0
Medium
0
Old
12
Area codes
1
States
1
Address
330 E Black St
Rock Hill, SC 29730-5377
330 E Black St
Rock Hill, SC 29730-5377
Website
comporium.com
comporium.com
First assigned block
2004-02-20
2004-02-20
Last assigned block
2015-12-10
2015-12-10
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HQ — Rock Hill, SC
Block portfolio at a glance
By age
- Recent (0) — last 18 mo
- Medium (0)
- Old (12)
- Undated (4)
Footprint by state
Stronger blue = more blocks issued in that state. ● marks states with activity in the last 18 months.
- South Carolina SC · 16
Top area codes
Bars show total blocks; red overlay is recent.
Block assignments by year
Sister OCNs in the Comporium Communications group
Same customer-facing carrier, different state-registered OCN. Combined stats are on the Comporium Communications group page.
| OCN | Company name on file | HQ state | Total | Recent |
|---|---|---|---|---|
| 0542 | Comporium Inc | SC | 53 | — |
| 0531 | Lancaster Telephone Company | SC | 22 | — |
| 749H | Comporium Inc - NC | SC | 2 | — |
Sister OCNs under Comporium Inc
| OCN | Company | Total | Recent |
|---|---|---|---|
| 9412 | Springboard Telecom LLC - NC | 26 | 0 |
| 0531 | Lancaster Telephone Company | 22 | 0 |
| 0473 | Citizens Telephone Company | 6 | 0 |
| 4649 | Springboard Telecom LLC | 0 | 0 |
| 9288 | Springboard Telecom LLC - NC | 0 | 0 |