# Frequently Asked Questions
[an only one smartphone be connected?](#can-only-one-smartphone-be-connected)\
[How long does it take to connect the device?](#how-long-does-it-take-to-connect-the-device)\
[How does the connection work?](#how-does-the-connection-work)\
[Nothing appears on car multimedia screen. It won't start. Cannot connect.](#nothing-appears-on-car-multimedia-screen.-it-wont-start.-cannot-connect)
[What Wi-Fi frequency is used?](#what-wi-fi-frequency-is-used)\
[Can I make calls using my smartphone?](#can-i-make-calls-using-my-smartphone)\
[Can I use all apps?](#can-i-use-all-apps)\
[In DeX, some apps get some errors.](#in-dex-some-apps-get-some-errors)\
[What is the connection range between the smartphone and AutoPro X?](#what-is-the-connection-range-between-the-smartphone-and-autopro-x)\
[How do I send logs when an error occurs?](#how-do-i-send-logs-when-an-error-occurs)
[It is not in silent mode, but there is no sound.](#it-is-not-in-silent-mode-but-there-is-no-sound)\
[for a Toyota or Lexus vehicle.](#for-a-toyota-or-lexus-vehicle)\
(DeX) [DeX disconnects intermittently.](#dex-disconnects-intermittently)\
(DeX) [I can't hear any sound after a DeX call.](#i-cant-hear-any-sound-after-a-dex-call)\
(AA) [If AA is not connected after getting off for a short period of time](#if-aa-is-not-connected-after-getting-off-for-a-short-period-of-time)\
(AA) [AA Intermittent disconnection occurs](#aa-intermittent-disconnection-occurs)
### Can only one smartphone be connected?
You can connect multiple smartphones to one device. However, simultaneous use is not possible, and the most recently connected smartphone takes priority. Therefore, if more than one smartphone is registered with the device, it's recommended to disable Wi-Fi and Bluetooth on smartphones that you do not wish to connect to ensure a smooth connection.
***
### How long does it take to connect the device?
The connection time varies depending on the car model and smartphone, but on average, the connection is completed within 20 seconds.
***
### How does the connection work?
* **AA(Android Auto)**
The connection is established using Wi-Fi and Bluetooth. The initial connection is made via Bluetooth, and then information is transmitted through Wi-Fi. Therefore, do not turn off Wi-Fi or Bluetooth during use.
* **DeX(AutoPro X)**
The connection is established using Wi-Fi Direct. If Wi-Fi is disabled during use, the connection may be terminated.
***
### Nothing appears on car multimedia screen. It won't start. Cannot connect.
Please refer to[ **this dedicated page >**](/kor/eng/entry_issue.md)
***
### What Wi-Fi frequency is used?
It uses 5GHz Wi-Fi.
***
### Can I make calls using my smartphone?
#### **■** How to switch call audio output
* **AA(Android Auto)**\
When Android Auto is connected, for safety reasons, phone calls can only be made through the vehicle, not the smartphone. Therefore, the call audio is output through the vehicle's speakers. If you wish to make calls using your smartphone, you can resolve this by following the method outlined below.
**STEP01** Vehicle Display ▶ Incoming Call ▶ Answer Call
**STEP02** Call Screen ▶ Select the Bluetooth Icon
**STEP03** Popup List ▶ Select Handset
* **DeX(AutoPro X)**\
When AutoPro X mode is connected, for safety reasons, phone calls can only be made through the vehicle, not the smartphone. Therefore, the call audio is output through the vehicle's speakers. If you wish to make calls using your smartphone, please refer to the method outlined above to resolve this.
***
### Can I use all apps?
The apps you can use vary depending on the mode you're using. Please refer to the explanation below for details.
* **AA(Android Auto)**
You can use most apps supported by Google Play Store and your smartphone. However, when using the Android Auto feature, only the apps designated by Google for safe driving are available. Please check if the app you wish to use is supported by Android Auto.
[Android Auto Supported Apps >](https://play.google.com/store/apps/stream/promotion_collections_android_auto)
* **DeX(AutoPro X)**
You can use the apps installed on your smartphone. (Some apps may not function properly on DeX.)
***
### In DeX, some apps get some errors.
* **DeX(AutoPro X)**
* **Content Display Error**\
This issue occurs because the app does not match the format requested by DeX. You may experience limited functionality or need to use the app in maximized screen mode.
* **App Usage Halted Due to Power Saving Mode**\
When using your phone in power-saving mode, DeX connectivity issues or app interruptions may occur. To resolve this, either disable power-saving mode or set the battery restriction for apps used in AutoPro X mode to "Unrestricted."
***
### What is the connection range between the smartphone and AutoPro X?
It can vary depending on the surrounding environment. Under normal conditions, the connection range is approximately 10 meters.
***
### How do I send logs when an error occurs?
To send logs when an error occurs, you can report the issue through the web or app using the bug report feature.\
[How to Report an Error >](/kor/eng/app/err_report.md)
***
### **for** a Toyota or Lexus vehicle.
For Toyota and Lexus vehicles, a separate power supply cable is required. The USB port in these vehicles may not provide sufficient power, so connecting via a separate black power supply cable (Y-cable) will ensure smooth operation.
***
### **It is not in silent mode, but there is no sound in DeX mode.**
Try one of the following methods to resolve the issue of no sound in DeX mode.
1. Downgrade the firmware and then upgrade it again. [**See in detail>**](/kor/eng/autopro-x-dex/update.md)\
Example: Downgrade to V3.5.1 => Re-update to V3.5.2
2. Connect to Android Auto for the first time. [**See in detail>**](/kor/eng/connect-1.md)
***
### DeX disconnects intermittently.
This issue occurs with DeX (AutoPro X).
#### Disable power-saving mode on your phone.
If power-saving mode is enabled on your smartphone, it may cause issues with DeX.
**STEP** Settings ▶ Battery ▶ Select Power Saving Mode ▶ Disable
***
### I can't hear any sound after a DeX call.
This issue occurs with DeX (AutoPro X).
While using DeX, Bluetooth may disconnect or sound may not output after a call. If this happens, please follow the steps below to resolve the issue.
**Use after connecting to Android Auto once →** [How to connect to Android Auto](/kor/eng/connect-1.md)
{% hint style="info" %}
**In the following cases, connect Android Auto once.**
* On first purchase
* After updating the firmware of the product
* If you '**reset the device**' in the app's Settings menu
{% endhint %}
### If AA is not connected after getting off for a short period of time
This is for Android Auto (AA).
If the vehicle fails to automatically connect when re-boarding after getting off for a short period of time (less than a minute), touch the activate button to connect again after deactivating Wi-Fi.
---
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