This page provides information about how you can place outgoing calls from your USC telephone and how non-USC callers can reach you on your USC telephone. The page also explains how to place a long-distance call from your USC telephone.
Placing Calls to USC Phones
We encourage you to dial a five-digit extension number for the following campus area codes and prefixes:
| Area Code | Prefix | Extension |
| 213 | 740 | 0-XXXX |
| 213 | 821 | 1-XXXX |
| 213 | 743 | 3-XXXX |
| 323 | 442 | 2-XXXX |
| 323 | 224 | 4-XXXX |
| 323 | 865 | 5-XXXX |
| 323 | 442 | 2-XXXX |
| 323 | 442 | 2-XXXX |
| 626 | 457 | 7-XXXX |
| 310 | 510 | 6-XXXX |
Note: County Hospital requires dialing the seven-digit telephone number.
Placing Calls to Non-USC Phones
| Local Calls | ||
| 411 Information | Dial 9 + 411 | |
| 800 Information | Dial 9 + 1 + 800 + 555-1212 | |
| 213 Area Code (UPC) | Dial 9 + 1 + 213 + XXX-XXXX | |
| 323 Area Code (HSC) | Dial 9 + 1 + 323 + XXX-XXXX | |
| 800, 877, 888 Area Codes | Dial 9 + 1 + Area Code + XXX-XXXX | |
| Any Area Code Other Than 213 (UPC) | Dial 9 + 1 + Area Code + XXX-XXXX | |
| Any Area Code Other Than 323 (HSC) | Dial 9 + 1 + Area Code + XXX-XXXX |
NOTE: As of July 8, 2017, you need to dial “9” plus “1” plus the full 10-digit phone number (9 + 1 + area code + 7-digit phone number) when calling an off-campus 213 or 323 phone number from your campus phone.
Operator Calls
- Outside Operator Dial 9 + 0
- Campus Operator Dial 0
- Campus Information 213-740-2311
Receiving Calls from Non-USC Phones
Non-USC callers can reach you by dialing your complete telephone number.
On the University Park campus (UPC), complete telphone numbers take the following forms: 213-740-XXXX, 213-743-XXXX, and 213-764-XXXX.
On the Health Sciences campus (HSC), telephone numbers are in the following format: 323-442-XXXX.
Be sure to include the proper area code (213 or 323) when giving off-campus callers your telephone number.
Placing Long-Distance Calls
A Long Distance Caller Identification Number (CID) must typically be used for long distance calls.
| Information | Dial 9 + 1 + Area Code + 555-1212 + CID | |
| Direct Dialing | Dial 9 + 1 + Area Code + XXX-XXXX + CID |
| International Calls | |
| Direct Dialing | Dial 9 + 011 + XX + X + XXX-XXXX + CID |
Getting Help
For additional assistance with dialing to or from your telephone, please submit a request via a Communication Service Request (CSR) (USC Login Required).