Introduction
This manual provides detailed instructions for the installation, operation, and maintenance of your UNIDEN AS6404 Corded Landline Phone. Please read this manual thoroughly before using your phone and retain it for future reference. This phone features a backlit LCD, speakerphone function, caller ID, and various customizable settings to enhance your communication experience.

Figure 1: UNIDEN AS6404 Corded Landline Phone (White model shown)
1. Package Contents
Verify that your package contains the following items:
- Base Unit
- Handset
- Line Cord
- Handset Cord
- User Manual
2. Setup
2.1 Connecting the Handset
- Connect one end of the coiled handset cord to the handset.
- Connect the other end of the coiled handset cord to the jack labeled HANDSET on the side of the phone base unit.
2.2 Connecting the Telephone Line
- Connect one end of the telephone line cord to the jack labeled LINE on the back of the phone base unit.
- Connect the other end of the telephone line cord to your wall telephone jack.
2.3 Power Supply
The UNIDEN AS6404 is designed to operate without an external power adapter or batteries for basic functions, drawing power directly from the telephone line. This feature ensures functionality even during power outages. Some advanced features, such as LCD backlight and memory retention, may utilize a small internal battery (not user-replaceable) or rely on line power.
2.4 Wall Mounting
The phone is wall-mountable. To mount the phone:
- Locate the wall mounting holes on the back of the base unit.
- Install two screws (not included) into the wall, spaced appropriately for the mounting holes.
- Slide the phone onto the screws until it is securely in place.
3. Basic Operation
3.1 Making a Call
- Lift the handset or press the SPEAKER button.
- Listen for a dial tone.
- Dial the desired telephone number.
3.2 Answering a Call
- When the phone rings, lift the handset or press the SPEAKER button to answer.
3.3 Ending a Call
- Place the handset back on the cradle or press the SPEAKER button again if using speakerphone.
3.4 Speakerphone Function
To use the speakerphone:
- Press the SPEAKER button to initiate or answer a call without lifting the handset.
- Adjust the speaker volume using the volume control buttons (if available, refer to phone's physical buttons).
- Press the SPEAKER button again to end the call.
3.5 Redialing the Last Number
To redial the last number dialed:
- Lift the handset or press the SPEAKER button.
- Press the REDIAL button. The phone will automatically dial the last number.
4. Advanced Features

Figure 2: Close-up view of the UNIDEN AS6404 keypad and LCD display
4.1 Caller ID
The phone supports Caller ID (CID) for both incoming and outgoing calls, provided you have subscribed to the service from your telephone provider.
- Incoming CID: Stores up to 61 incoming call records. Use the UP/DOWN navigation buttons to review the call history.
- Outgoing CID: Stores up to 16 outgoing call records with conversation time review.
4.2 LCD Display Settings
The backlit LCD displays the Year, Month, Date, and Time. Refer to the phone's menu or SET button for instructions on adjusting these settings.
4.3 Ringer Volume Adjustment
You can adjust the ringer volume to High (HI), Medium (MID), Low (LOW), or Off (OFF) to suit your environment. Use the dedicated RINGER button or menu option to cycle through the settings.
4.4 Flash Time Selection
The flash time is selectable (100 / 300 / 600ms) to ensure compatibility with various telephone systems (PABX, etc.). Adjust this setting via the phone's menu if you experience issues with call transfer or conference features.
4.5 Message Waiting Lamp (MWL)
The Message Waiting Lamp (MWL) indicates when you have new messages in your voicemail service (PULSE, FSK, DTMF compatible). This feature requires subscription to a voicemail service from your telephone provider.
4.6 Tone/Pulse Dialing Mode
The phone supports both Tone and Pulse dialing modes. Select the appropriate mode based on your telephone line service. This setting is usually found in the phone's setup menu.
4.7 Ringer Tone Selection
Choose from various ringer tones to personalize your phone. Consult the user interface for available options and selection method.
4.8 Alarm Clock Function
The integrated alarm clock function allows you to set a wake-up or reminder alarm. Access this feature through the phone's menu settings.
4.9 Other Functions
- Pre Dial Function: Allows you to enter a number before lifting the handset or initiating a call.
- Music on Hold / Do Not Disturb (DND): These features may be available through specific button presses or menu options. Refer to the on-screen prompts or quick reference guide for activation.
- Contrast Adjustable: Adjust the LCD display contrast for optimal viewing.
- IDD Code and PABX Dial Outcode Setting: For international direct dialing or private automatic branch exchange systems.
5. Maintenance
5.1 Cleaning
To keep your phone in good condition:
- Wipe the phone with a soft, slightly damp cloth.
- Do not use harsh chemicals, cleaning solvents, or abrasive cleaners.
- Ensure no liquid enters the phone's openings.
5.2 Storage
If you need to store the phone for an extended period, disconnect it from the telephone line and store it in a cool, dry place away from direct sunlight and extreme temperatures.
6. Troubleshooting
If you encounter issues with your UNIDEN AS6404, refer to the following table for common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| No dial tone | Telephone line cord is loose or disconnected. | Ensure the telephone line cord is securely connected to both the phone and the wall jack. |
| No display on LCD | Phone not receiving sufficient line power. | Check line connections. If problem persists, contact your telephone service provider. |
| Caller ID not working | Caller ID service not subscribed or activated. | Contact your telephone service provider to ensure Caller ID service is active on your line. |
| Low speaker/handset volume | Volume setting is too low. | Adjust the volume using the dedicated volume buttons during a call. |
| Buttons not responding | Temporary software glitch. | Disconnect the phone from the telephone line for a few minutes, then reconnect it. |
7. Specifications
Below are the technical specifications for the UNIDEN AS6404 Corded Landline Phone:
| Feature | Description |
|---|---|
| Model Number | AS6404 |
| Product Dimensions | 18.42 x 19.69 x 5.72 cm |
| Item Weight | 340 g |
| Colour | White |
| Telephone Type | Corded |
| Material | Plastic |
| Power Source | Line Powered (Works Without Battery) |
| Display | Backlit LCD (Year, Month, Date & Time) |
| Caller ID | 61 Incoming CID, 16 Outgoing CID with Conversation Time Review |
| Ringer Volume | HI / MID / LOW / OFF settings |
| Flash Time | Selectable (100 / 300 / 600ms) |
| Dialing Mode | Tone/Pulse Dialing |
| Special Features | Speakerphone, Message Waiting Lamp (PULSE, FSK, DTMF), Ringer Tone Selectable, Alarm Clock, Wall Mountable, Contrast Adjustable, Pre Dial Function, Music on Hold / DND |
8. Warranty and Support
For warranty information, please refer to the warranty card included with your product or contact Uniden customer support directly. Keep your purchase receipt as proof of purchase for any warranty claims.
For technical support or further assistance, please visit the official Uniden website or contact their customer service department using the contact information provided in your product packaging or on their website.





