China Unicom’s general standard format is: 861301XXXX500. Note that the XXXX in China Unicom’s SMS center number is not the area code where the SIM is located. This number is edited by China Unicom, so it must be filled in according to different provinces. Generally, China Unicom releases information center numbers according to provinces, and some large and medium-sized cities will also release them separately.

The general coding rules for China Mobile's short message center service numbers are: 861380 (four-digit long-distance area code of the office where the account is opened) 500. If the long-distance area code has less than four digits, use "0" at the end.