Android mobile phone "local number" is displayed as "unknown" SOLUTION

In android mobile phone development, mobile phone numbers are sometimes required. In older SIM cards, China Mobile operator will write the numbers into SIM cards by default, but new SIM cards are often empty. To obtain the mobile phone number, you must manually set it to the SIM card. In the android system of the smartphone, the "local number" function cannot be set in gray. We recommend that you find a common mobile phone that can be set for number setting. Generally, you can set two numbers for the WCDMA card. We only need to set the first number. After the settings, reinstall the card to the Android mobile phone, and you can see the number in the "local number. You can also use getLine1Number () to obtain the mobile phone number. Good luck!

From Yunfeng column Software Technology