The invention relates to a method for using a China Mobile mobile phone to identify a UIM card, comprising: opening the China Mobile mobile phone, and correctly powering on the user identification card when the user identification card is initialized; The main directory of the identification card; according to the result returned by the user identification card when selecting the directory, judge whether the PIN code and PUK code of the user identification card are locked. If the PIN code or PUK code is locked, unlock the PIN code or PUK code; select the user The CDMA special directory of the identification card, if the CDMA special directory does not exist, initialize according to the process of the SIM card; if the CDMA special directory exists, then judge whether the IMSI in the GSM directory of the subscriber identity card is valid, if the IMSI is valid, the subscriber identity card It is a dual-mode card. If the IMSI is invalid, the subscriber identification card is a UIM card.