Local Calling Guide
Area code/prefix search
NPA: 520
[Rate centres in NPA 520]
[Dial plan for NPA 520]
NXX: 257
| NPA-NXX |
BLOCK |
Rate Centre |
Region |
Switch |
OCN |
LATA |
LIR |
Eff date |
Disc date |
| 520-257
| A |
Tucson |
AZ |
TCSMAZOI3MD |
6529 T-MOBILE USA, INC. |
668 |
|
|
|
| 520-257
| 0 |
Tucson |
AZ |
TCSMAZCH1MD |
6010 NEW CINGULAR WIRELESS PCS, LLC |
668 |
|
2014-10-25 |
|
| 520-257
| 1 |
Tucson |
AZ |
TCSNAZXGDS0 |
7465 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ |
668 |
|
2014-10-21 |
|
| 520-257
| 2 |
Tucson |
AZ |
TCSNAZMAVMD |
3285 LEVEL 3 COMMUNICATIONS, LLC - AZ |
668 |
|
2014-10-21 |
|
| 520-257
| 3 |
Tucson |
AZ |
TCSNAZMAVMD |
3285 LEVEL 3 COMMUNICATIONS, LLC - AZ |
668 |
|
2014-10-21 |
|
| 520-257
| 4 |
Tucson |
AZ |
TCSNAZMAVMD |
3285 LEVEL 3 COMMUNICATIONS, LLC - AZ |
668 |
|
2014-10-21 |
|
| 520-257
| 5 |
Tucson |
AZ |
TCSMAZOI3MD |
6529 T-MOBILE USA, INC. |
668 |
|
2014-10-18 |
|
| 520-257
| 6 |
Tucson |
AZ |
TCSMAZOI3MD |
6529 T-MOBILE USA, INC. |
668 |
|
2014-10-18 |
|
| 520-257
| 7 |
Tucson |
AZ |
TCSMAZOI3MD |
6529 T-MOBILE USA, INC. |
668 |
|
2014-10-18 |
|
| 520-257
| 8 |
Tucson |
AZ |
TCSMAZOI3MD |
6529 T-MOBILE USA, INC. |
668 |
|
2014-10-18 |
|
| 520-257
| 9 |
Tucson |
AZ |
TCSMAZOI3MD |
6529 T-MOBILE USA, INC. |
668 |
|
2014-10-18 |
|
Last updated: Tue, 15 Jul 2025 18:46:49 UTC
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