TelephonyManager returns null for IMEI number: what can cause this?

Question

I\'m working on an Android app and am getting null back for the IMEI number when using TelophonyManager. This is happening on several Huawei phones

Answer 1

After your comment, to get unique device id for the survey app, i would suggest you to use Settings.Secure.ANDROID_ID as your unique id.

String   myAndroidDeviceId = Secure.getString(getApplicationContext().getContentResolver(), Secure.ANDROID_ID);

Or you can use both as

public String getUniqueID(){    
    String myAndroidDeviceId = "";
    TelephonyManager mTelephony = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);
    if (mTelephony.getDeviceId() != null){
        myAndroidDeviceId = mTelephony.getDeviceId(); 
    }else{
         myAndroidDeviceId = Secure.getString(getApplicationContext().getContentResolver(), Secure.ANDROID_ID); 
    }
    return myAndroidDeviceId;
}