How does the mobile phone enter that test mode?

1. Let's talk about hiding the test menu first. To call the hidden test menu, you need to open the dialing interface and type * # * # 4636 # * * on the keyboard.

2. Then this test menu will appear by itself.

Because my mobile phone is dual-card, there are two short messages. When you enter the mobile phone information menu, you will find that some information such as mobile phone card network is displayed here. The following menu can also change the network standard (generally do not change, if you want to change, you should know in advance whether the mobile phone supports it). SMSC is sms channel of mobile phone card. If you can't send SMS, you can check this, or ask the operator the SMS center number of your mobile phone card and fill in the change. Other options need to be supplemented by Baidu brain.

4. This is the battery information menu, which shows some basic battery information.

5. Here is the usage statistics menu, which shows the usage time and startup time of some applications, so that you can analyze what applications are always started.