THERESA prefixes in area code 920
NANPA records 3 assigned NXX blocks to rate center THERESA in area code 920, 0.4% of the 785 blocks assigned in the code. A rate center is the billing geography a block is allocated to – NANPA truncates the name to ten characters, so read it as a NANPA label rather than a town. 2 holders hold those blocks, the largest being FRONTIER NORTH INC. - WI (2), TWILIO INTERNATIONAL, INC. (1). The earliest assignment on record here is 2001-06-12 and the most recent 2023-06-09. 3 of them are in thousands-block pooling, so those prefixes are shared between carriers in 1,000-number lots. The same rate center name also appears in area codes 315, 680 – overlay codes cover the same geography, so a rate center is served by all of them.
Prefixes assigned here
| Prefix | Holder of record | Assigned | Pooled | In service |
|---|---|---|---|---|
| 920-276 | Frontier FRONTIER NORTH INC. - WI | 2001-06-12 | yes | yes |
| 920-353 | Twilio TWILIO INTERNATIONAL, INC. | 2023-06-09 | yes | yes |
| 920-488 | Frontier FRONTIER NORTH INC. - WI | – | yes | yes |
The holder is who received the block from the numbering administrator. It is not necessarily the carrier serving a given number: numbers move with their owners, and a pooled block is shared.
Who holds the blocks
| Holder | Brand | Blocks | Share here |
|---|---|---|---|
| FRONTIER NORTH INC. - WI | Frontier | 2 | 66.7% |
| TWILIO INTERNATIONAL, INC. | Twilio | 1 | 33.3% |
Frequently asked
Which prefixes belong to THERESA in area code 920?
3 blocks: 276, 353, 488. The table above gives the holder of each.
Which carriers have numbers in THERESA?
FRONTIER NORTH INC. - WI (2 blocks), TWILIO INTERNATIONAL, INC. (1 block). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.
Is THERESA a city?
It is a rate center – the unit NANPA allocates number blocks to. Its name is abbreviated to ten characters and is not necessarily a settlement: we print it as recorded rather than guess at the full name.