Get Phone Number in Android using TelephonyManager

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1- Android Phone number

android.telephony.TelephonyManager class provides information regarding telephony services such as ID, EMEI Number, SIM Serial Number, Phone Network Type, etc. In addition, it also provides the information about the phone status.
In this article, I'm going to guide you to use TelephonyManager in order to get the phone number information of the  Android device, and a few pieces of other common information.
It is required that the application is given permission to view phone status information, so you need to add the following permissions to the AndroidManifest.xml file :

<uses-permission android:name="android.permission.READ_PHONE_STATE"/>
 
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="org.o7planning.getphonenumberexample">

    <uses-permission android:name="android.permission.READ_PHONE_STATE"/>

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>
Note: From Android 6.0 (API Level 23) onwards, an application wants to know the status of the phone it needs to ask to get user permission.
Here is the interface of the example app:
main_activity.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <Button
        android:id="@+id/button_getInfo"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="16dp"
        android:text="Get Phone Infos"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/editText_infos" />

    <EditText
        android:id="@+id/editText_infos"
        android:layout_width="0dp"
        android:layout_height="150dp"
        android:layout_marginStart="16dp"
        android:layout_marginLeft="16dp"
        android:layout_marginTop="32dp"
        android:layout_marginEnd="16dp"
        android:layout_marginRight="16dp"
        android:ems="10"
        android:gravity="top|left"
        android:hint="Phone Number"
        android:inputType="textMultiLine"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>
MainActivity.java
package org.o7planning.getphonenumberexample;

import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;

import android.Manifest;
import android.annotation.SuppressLint;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.telephony.SignalStrength;
import android.telephony.TelephonyManager;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    private static final int MY_PERMISSION_REQUEST_CODE_PHONE_STATE = 1;

    private static final String LOG_TAG = "AndroidExample";

    private EditText editTextPhoneNumbers;

    private Button buttonGetPhones;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        this.editTextPhoneNumbers = (EditText) this.findViewById(R.id.editText_infos);

        this.buttonGetPhones = (Button) this.findViewById(R.id.button_getInfo);

        this.buttonGetPhones.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                askPermissionAndGetPhoneNumbers();
            }
        });
    }

    private void askPermissionAndGetPhoneNumbers() {

        // With Android Level >= 23, you have to ask the user
        // for permission to get Phone Number.
        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.M) { // 23

            // Check if we have READ_PHONE_STATE permission
            int readPhoneStatePermission = ActivityCompat.checkSelfPermission(this,
                    Manifest.permission.READ_PHONE_STATE);

            if ( readPhoneStatePermission != PackageManager.PERMISSION_GRANTED) {
                // If don't have permission so prompt the user.
                this.requestPermissions(
                        new String[]{Manifest.permission.READ_PHONE_STATE},
                        MY_PERMISSION_REQUEST_CODE_PHONE_STATE
                );
                return;
            }
        }
        this.getPhoneNumbers();
    }

    // Need to ask user for permission: android.permission.READ_PHONE_STATE
    @SuppressLint("MissingPermission")
    private void getPhoneNumbers() {
        try {
            TelephonyManager manager = (TelephonyManager) this.getSystemService(Context.TELEPHONY_SERVICE);

            String phoneNumber1 = manager.getLine1Number();

            this.editTextPhoneNumbers.setText(phoneNumber1);

            //
            Log.i( LOG_TAG,"Your Phone Number: " + phoneNumber1);
            Toast.makeText(this,"Your Phone Number: " + phoneNumber1,
                    Toast.LENGTH_LONG).show();

            // Other Informations:
            if(android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) { // API Level 26.
                String imei = manager.getImei();
                int phoneCount = manager.getPhoneCount();

                Log.i(LOG_TAG,"Phone Count: " + phoneCount);
                Log.i(LOG_TAG,"EMEI: " + imei);
            }
            if(android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.P) { // API Level 28.
                SignalStrength signalStrength = manager.getSignalStrength();
                int level = signalStrength.getLevel();

                Log.i(LOG_TAG,"Signal Strength Level: " + level);
            }

        } catch (Exception ex) {
            Log.e( LOG_TAG,"Error: ", ex);
            Toast.makeText(this,"Error: " + ex.getMessage(),
                    Toast.LENGTH_LONG).show();
            ex.printStackTrace();
        }
    }


    // When you have the request results
    @Override
    public void onRequestPermissionsResult(int requestCode,
                                           String permissions[], int[] grantResults) {

        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        //
        switch (requestCode) {
            case MY_PERMISSION_REQUEST_CODE_PHONE_STATE: {

                // Note: If request is cancelled, the result arrays are empty.
                // Permissions granted (SEND_SMS).
                if (grantResults.length > 0
                        && grantResults[0] == PackageManager.PERMISSION_GRANTED) {

                    Log.i( LOG_TAG,"Permission granted!");
                    Toast.makeText(this, "Permission granted!", Toast.LENGTH_LONG).show();

                    this.getPhoneNumbers();

                }
                // Cancelled or denied.
                else {
                    Log.i( LOG_TAG,"Permission denied!");
                    Toast.makeText(this, "Permission denied!", Toast.LENGTH_LONG).show();
                }
                break;
            }
        }
    }


    // When results returned
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        if (requestCode == MY_PERMISSION_REQUEST_CODE_PHONE_STATE) {
            if (resultCode == RESULT_OK) {
                // Do something with data (Result returned).
                Toast.makeText(this, "Action OK", Toast.LENGTH_LONG).show();
            } else if (resultCode == RESULT_CANCELED) {
                Toast.makeText(this, "Action Cancelled", Toast.LENGTH_LONG).show();
            } else {
                Toast.makeText(this, "Action Failed", Toast.LENGTH_LONG).show();
            }
        }
    }
}

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