What do mobile phone ussd code and mmi code mean? How to cancel?

USSD is an unstructured supplementary data service, which is a new interactive data service based on GSM network. ?

when you use the mobile phone keyboard to input some numbers or symbols that have been pre-established by the network, such as * #, and then press send, that is, the dial key, you can send an instruction to the network, and the network will select the service you need to provide you according to the instruction.

MMI code belongs to the communication company, and this function is to enable incoming call forwarding.

cancellation method

1. This prompt pops up because when you use the mobile phone keyboard to enter some numbers or symbols that have been pre-established in the network, such as * #, and then press the dial key, you can send an instruction to the operator.

2. The operator's service is opened by using the secret code, but the number keys that are touched by mistake are generally invalid codes. If you want to cancel, you only need to confirm whether the service has been newly opened to the operator, and this operation will not affect the normal use of the mobile phone.

extended information:

1. Android hidden code

1. Mobile phone function test code

Android mobile phone users input "* # * # 121314 # * *", and the function of this code is to test the function of the mobile phone screen, receiver and speaker.

2. data information of mobile phone

when "* # * # 4636 # * *" is entered in the dial key, the information of mobile phone, battery information, WIFI information and so on will be displayed.

2. Apple's hidden code

1. Inquiring about the SMS center

When the mobile phone function of Apple is normal, but it can't send messages, users can enter "*#55*7672#" and then dial, and the number of the SMS center can be found, and the SMS function will be restored to normal after it is set correctly

2. Signal display mode < p

if you want to display the digital signal mode all the time, you can press and hold the power button in the FieldTest program until you see the interface of "sliding shutdown". Don't turn it off, press and hold the Home button until you return to the main interface.

At this time, the signal strength has been changed to digital display mode, so you can click on the upper left corner to switch between the two display modes.

Third, the hidden code for Apple and Android

1. Incoming call forwarding

Enter "**62* number #" and press the dial key to set it to power off or call forwarding out of service area. Enter "##62#" to cancel.

2. Inquire about call forwarding status

Enter "*#21#" and then press the dial key to inquire about the current call forwarding status of mobile phones, such as voice, data, fax and SMS.

3. Inquire about the IMEI number

Enter "*#6#" in the dialing interface to inquire about the IMEI number of the mobile phone. The function of this number is that it can judge whether the mobile phone is a genuine original mobile phone, a water reform machine or a refurbished machine.

Reference: Baidu Encyclopedia -USSD.