# Connect with Android phone

## Mobile App Download <a href="#download-app" id="download-app"></a>

You can download the D'CENT Mobile App by clicking on this [**link**](https://play.google.com/store/apps/details?id=com.kr.iotrust.dcent.wallet).

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## Mobile App basic setting <a href="#basic-setup-for-mobile-app" id="basic-setup-for-mobile-app"></a>

### Select Wallet mode <a href="#select-wallet-mode" id="select-wallet-mode"></a>

If you are launching the mobile app for the first time, you will need to go through the initial setup and select a wallet mode.

{% hint style="warning" %}
This guide is based on **D’CENT mobile app version 8.0.0**.
{% endhint %}

When the app launches, select **“Biometric Wallet”** as shown below.

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You can change the **wallet mode** at any time from the **Settings** tab in the mobile app.\
If you are using a **biometric cold wallet**, make sure to set the wallet mode to **"Biometric"** in the mobile app. For instructions on how to change the wallet mode, [**refer to this guide**](https://userguide.dcentwallet.com/dcent-app/mobile-app-setting-menu/manage-all-wallets).

### **App Password Registration**

To protect your **D'CENT mobile app**, you must set a **6-digit password**. This **app password** will be required **every time you launch the D'CENT mobile app**, so be sure to remember it.

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{% hint style="info" %}
You can change your **app password** later through the app [**Settings menu**](https://userguide.dcentwallet.com/dcent-app/mobile-app-setting-menu)**.**

In addition to the app password, you can also **enable fingerprint recognition** for added security.
{% endhint %}

### **Mobile App Permission Settings**

A permission request popup will appear when you launch the D’CENT mobile app. Review the permissions being requested, then click **“Confirm”** button to proceed.

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Next, click the **“Allow”** button for both the **Notification** and **Nearby Devices** permissions to continue.

{% hint style="danger" %}
The **Notification** permission is optional. You can click the **“Don’t allow” button** and still connect your wallet without any issues. However, the **Nearby Devices** permission is **required** for syncing with the cold wallet.\
If access is denied, the cold wallet cannot be synced, and usage will be restricted.\
Therefore, be sure to allow this permission.
{% endhint %}

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If the permission popup does not appear, or if you accidentally clicked the **“Don’t allow”** button, you can manually enable the **Nearby Devices** permission by following the steps shown below.

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## Bluetooth pairing with Cold Wallet

**First, turn on the cold wallet, unlock using your fingerprint or PIN authentication.**

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**You can connect your cold wallet to the D'CENT mobile app via Bluetooth using the following steps.**

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**1)** Open the **D'CENT mobile app** and select **"Bluetooth icon"** at the top of the **"My Wallet"** tab.

**2)** A **"Search Device"** popup will appear, displaying the **Device ID(`D'CENT-iD-<numbers or letters>`)** of the cold walle&#x74;**.**&#x20;

Please refer to [**this guide**](#how-to-check-the-device-id) on how to check the device ID of your cold wallet.

{% hint style="warning" %}
If the device ID of your cold wallet does not appear in the **"Search Device"** popup, please make sure that **Bluetooth is enabled** in your Android phone’s settings. If you're unsure how to access the Bluetooth menu, please refer to [**this guide**](#android-phone-bluetooth-settings).
{% endhint %}

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**3)** When you tap the device ID, the cold wallet will sync automatically. It may take a few seconds for the synchronization to begin.

**4)** When synchronization is complete:

* A **connection indicator** will appear in the **top** of the **mobile app**.
* A **blue Bluetooth connection light** will stay turned on in the **top right corner** of the **cold wallet**.

{% hint style="info" %}
If you prefer **not to use Bluetooth**, you can also connect your **cold wallet to an Android phone** using an **OTG cable**. For detailed instructions, **please refer to** [**this guide**](https://userguide.dcentwallet.com/biometric-wallet/android-connect/android-otg).
{% endhint %}

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Now, you can tap the **"Add Account"** button to add the necessary **coin accounts**. For detailed instructions on **adding coin accounts**, click [**here**](https://userguide.dcentwallet.com/dcent-app/create-account).

### **How to Check the Device ID**

Each biometric cold wallet has a unique device ID. You can check the device ID of each device using the following steps.

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**1) Turn on the cold wallet**, authenticate using your **fingerprint or PIN**, then navigate to the **"Settings"** menu and press **"OK"** button.

**2) Select the "Device Info." menu** and press  **"OK"** button.

**3)** On the Device Info screen, the **Device ID(`D'CENT-iD-<numbers or letters>`)** will be displayed&#x20;

If you're having trouble connecting the cold wallet, please refer to the **Troubleshooting Guide** below.

{% content-ref url="android-connect/troubleshooting-guide-android-bluetooth-error" %}
[troubleshooting-guide-android-bluetooth-error](https://userguide.dcentwallet.com/biometric-wallet/android-connect/troubleshooting-guide-android-bluetooth-error)
{% endcontent-ref %}