How to get your Android device ID with Telephonymanager#getDeviceId()?

Question

How to get your Android device ID with Telephonymanager#getDeviceId()?

Asked 7 years, 7 months ago

Viewed 2,415 times

3

I’m using this code to catch the ID of the device Android.

TelephonyManager telephonyManager = (TelephonyManager) getActivity().getBaseContext().getSystemService(Context.TELEPHONY_SERVICE);
id = telephonyManager.getDeviceId();

But now I’ve noticed that in some cases, the ID was recorded as null.

I’m not sure about getting the ID thus?
Under what circumstances does this return null?

Take a look at this link... http://stackoverflow.com/questions/7514163/using-telephony-manager-in-android-to-find-imei-number

– Jefferson Rudolf

2017/04/13 at 20:12
So.. according to the link is right. It is a way to get the IMEI from the mobile. In the table where these Inserts were made I discovered some 15 cases where this value came null. Now I need to find out in which cases this happens.

– Reginaldo Rigo

2017/04/13 at 20:14
It depends somewhat on its purpose of use. I suggest reading this article : https://developer.android.com/training/articles/user-data-ids.html But I warn you that there is a unique identifier generated at the time of installation that is registered on Google servers. This may suit you. See https://developer.android.com/reference/android/provider/Settings.Secure.html#ANDROID_ID

– Rafael

2017/04/13 at 23:30

2 answers

4

I’m not sure to get the ID that way?

Not for the end you want. Telephonymanager#getDeviceId() returns the IMEI on a phone GSM or the MEID or ESN telephone CDMA. Not all Android devices are phones.

In what circumstances does this return null?

When the device is not a phone.
_{(How to know if your device is Smathphone or Tablet and/or is able to send SMS?)}

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by viana • **27,141** points · Answer 1 · 2017-04-13T20:24:05+00:00

The getDeviceId() returns only value when the device is considering a phone.

If you want to get a "unique" identifier from the device you can use Secure.ANDROID_ID. Take an example:

import android.provider.Settings.Secure;
private String android_id = Secure.getString(
    getContext().getContentResolver(), Secure.ANDROID_ID);

However, you should be careful as it is possible to edit the device’s factory setting, for example by changing this value.

In best practices for unique identifiers says the following:

1: Avoid the use of hardware identifiers. Hardware identifiers such as SSAID (Android code) and IMEI can be avoided in most cases of use without limiting the necessary resources.