VTech IS8151-3
VTech IS8151-3 Cordless Phone System User Manual
Model: IS8151-3 | Brand: VTech
Introduction
This user manual provides comprehensive instructions for setting up, operating, and maintaining your VTech IS8151-3 Super Long Range DECT 6.0 Cordless Phone System. This system is designed to offer extended range, smart call blocking, and seamless integration with your cellular devices via Bluetooth, enhancing your home communication experience.
Key Features
- Super Long Range: Experience extended coverage up to 2300 feet, allowing calls anywhere in your home, yard, or even nearby areas.
- Smart Call Blocker and Caller ID Announce: Block nuisance callers with one touch, filter robocalls, and screen unknown callers. The system announces caller IDs for convenience.
- Bluetooth Connect to Cell: Make and receive cellular calls using your home phone handsets. Pair up to two cell phones or one cell phone and one Bluetooth headset. Access voice assistants like Siri or Google Now from handsets.
- Digital Answering System with Voice Guide: Records up to 22 minutes of messages, announcements, and memos. Features an LED message counter and a built-in voice guide for easy setup.
- Large Screens, Big Text, Lighted Keypad: Handsets feature a 2-inch screen and the base has a 3.5-inch screen with high-contrast, enlarged text for easy readability. Backlit keypads facilitate dialing in low-light conditions.
- Charger Backup for Power Failure: Ensures continued operation during power outages.
- Headset Jack and Belt Clip: Provides options for hands-free communication and portability.
- Download and Store Cell Phone Directory: Sync up to 4,000 cellular phone book entries to the system.
Setup Guide
1. Package Contents
Ensure all items are present in your package:
- Telephone base
- 3 cordless handsets
- 3 AC adaptors
- 3 Nonstandard Battery batteries (included)
2. Initial Setup and Charging
Step 1: Connect the Base Unit. Plug the telephone line cord into the base unit and a telephone wall jack. Plug the AC adapter into the base unit and a power outlet.
Step 2: Install Handset Batteries. Open the battery compartment on each handset and insert the included batteries, observing polarity. Close the compartment.
Step 3: Charge Handsets. Place each handset in its charging cradle. Allow at least 16 hours for the initial charge to ensure optimal battery performance. The CHARGE light on the handset will illuminate.

Image: The VTech IS8151-3 cordless phone system, showing the main base unit with one handset and two additional charging cradles with handsets. This illustrates the complete system setup.
3. Bluetooth Connect to Cell Setup
The system allows you to pair up to two Bluetooth-enabled cellular phones. Ensure your cell phone is within range of the telephone base.
- On the telephone base, press MENU.
- Use the ▼ (down arrow) to scroll to Bluetooth, then press SELECT.
- Select Add device, then Add cellular.
- The base will prompt you to disconnect your cell phone from any other Bluetooth devices. Press NEXT.
- Place your cell phone next to the base and press NEXT. The base will display "Set cell to search base: VTech DECT 6.0 PIN: 0000".
- On your cell phone, go to its Bluetooth settings and select VTech DECT 6.0 from the list of available devices.
- When prompted on your cell phone, confirm the pairing by selecting Allow or entering the PIN (0000) if requested.
- Once connected, the telephone base will display "Cell phone is added and connected to base."
Note: The system supports pairing with two cellular phones simultaneously.

Image: The VTech phone base unit next to a smartphone, demonstrating the ability to download and store your cell phone directory, syncing up to 4,000 contacts.
Operating Instructions
1. Making and Receiving Calls
The VTech IS8151-3 allows you to make and receive calls via your landline or connected cellular phones.
- To make a call: Pick up a handset or press HOME (for landline) or CELL 1/CELL 2 (for cellular) and dial the number.
- To answer a call: Press any dial key (0-9, #, *) or the HOME or CELL button when the phone rings.
- Speakerphone: Press the SPEAKER button during a call to activate the speakerphone.

Image: An illustrative diagram of a multi-story house, demonstrating the freedom to make and receive both cellular and landline calls from various locations within the home using the VTech phone system.
2. Smart Call Blocker
The Smart Call Blocker feature helps filter unwanted calls. You can block numbers, screen robocalls, and manage a whitelist of allowed callers.
- To block a number during a call: Press the CALL BLOCK button.
- To screen robocalls: Set the system to ask callers to press the pound key.
- To screen unknown callers: Set the system to ask callers to record their names. The phone will ring and announce the name, allowing you to accept, block, or forward the call.

Image: A VTech handset prominently displaying the 'BLOCK' button, with a finger poised to press it. This visual emphasizes the one-touch call blocking feature, protecting users from unwanted calls.
3. Digital Answering System
The integrated answering machine records up to 22 minutes of messages. A voice guide assists with setup.
- Playing messages: Press PLAY/STOP on the telephone base.
- Recording announcements: Follow the voice guide prompts to record your outgoing message.
- Message counter: The LED display on the base shows the number of new messages.

Image: The VTech phone base and a handset, highlighting the digital answering system's capabilities, including 22 minutes of recording time for incoming messages, outgoing announcements, and a helpful built-in voice guide.
4. Intercom Function
Use the intercom feature to communicate between handsets or between a handset and the base unit.
- Press INT on the handset or base.
- Dial the number of the desired handset (1-12) or press ALL to call all handsets.
- The receiving handset will ring. Press any key to answer.
5. Phonebook and Caller ID
The system supports a phonebook for frequently called numbers and displays Caller ID information.
- Adding contacts: Manually add entries or download up to 4,000 contacts from a paired cellular phone.
- Caller ID Announce: The system announces the name of the caller (if available in your phonebook or Caller ID service) through the handset and base speaker.

Image: The VTech phone base and a handset showing an incoming call with Caller ID information. A graphic of a loudspeaker and text "Calling from Johnson" illustrates the Caller ID Announce feature.
Maintenance
Proper care ensures the longevity of your phone system.
- Cleaning: Wipe the phone and base with a soft, damp cloth. Do not use cleaning sprays or harsh chemicals.
- Battery Care: Replace batteries when they no longer hold a charge. Use only the specified battery type.
- Location: Avoid placing the phone in direct sunlight, near heat sources, or in areas with excessive moisture.
Troubleshooting
| Problem | Possible Solution |
|---|---|
| No dial tone |
|
| Handset not charging |
|
| Cannot pair Bluetooth cell phone |
|
| Poor range or static |
|
| Smart Call Blocker not working as expected |
|
Specifications
- Model: IS8151-3
- Product Dimensions: 4.48 x 7.4 x 8.73 inches
- Item Weight: 2.92 pounds
- Batteries: 3 Nonstandard Battery batteries required (included)
- Telephone Type: Cordless DECT 6.0
- Answering System Type: Digital (22 minutes recording time)
- Material: Plastic
- Color: Silver/Black
- Power Source: Corded Electric
- Expandability: Expandable to 12 handsets
- Bluetooth: Connect to Cell (pair up to 2 cell phones)
- Range: Up to 2300 feet (optimal conditions)
Warranty and Support
For detailed warranty information and technical support, please refer to the official VTech website or the included warranty card.
You can also find additional resources and support documents, including the full User Manual (PDF), on the VTech product support page.
- Official User Manual (PDF): Download Here
- VTech Store on Amazon: Visit Store
Ask a question about this manual
Ask about setup, troubleshooting, compatibility, parts, safety, or missing instructions. Manuals+ will review the question and use this page’s manual context to help answer it.







