GSM Landline Bug

The gsm landline bug is a versatile call monitoring device that connects directly to standard BT telephone sockets, joining our advanced collection of GSM listening bugs.

Engineered for covert deployment, it enables you to monitor incoming and outgoing landline calls live from any global location.

Its compact design ensures it functions seamlessly in the background without affecting landline call quality, volume, or signal stability.

Discreet Connection to Any Live BT Outlet

This intelligent surveillance unit plugs directly into any active telephone wall socket along the target landline circuit.

If a spare or secondary BT outlet exists behind furniture or inside a cupboard, it can be deployed completely out of view.

Alternatively, using a standard two-way BT line splitter allows it to share an outlet with an existing home or office telephone.

Because the hardware operates silently, neither party on the line receives any click, volume drop, or audible tone when monitoring is active.

Real-Time Call Alerts and Room Surveillance

Setting up the gsm landline bug is straightforward, and all system settings can be managed remotely via SMS text commands from your mobile handset.

When an incoming or outgoing landline call occurs, the device automatically dials your pre-programmed mobile number to establish a live audio feed.

You can choose to answer and listen live to the conversation or decline the call without interrupting the landline connection.

In addition to line monitoring, the unit features an internal microphone that allows you to dial in at any time to listen to ambient room conversation within a 5-metre radius.

Integrated vibration and motion sensors can also be enabled to send instant SMS alerts if the unit is moved or tampered with.

Record Conversations Remotely for Evidence

While the gsm landline bug transmits live audio, you can capture recordings remotely on your receiving mobile phone for evidential purposes.

Pairing your smartphone with a dedicated Bluetooth Call Recorder allows you to save time-stamped audio files directly to your device.

It can run on its internal rechargeable battery for short-term tasks or remain connected to the supplied AC adapter for permanent deployment.

Using a dedicated landline listening device provides invaluable intelligence for security, dispute resolution, and evidence gathering.

Provided you deploy your surveillance equipment for lawful purposes, the situations that suit using a voice recording device or landline bug are extensive.

If you require technical guidance on setting up your gsm landline bug, please feel free to contact our expert team today.

Can this gsm landline bug be hidden completely inside a telephone wall socket?

No. The unit is housed in a compact external enclosure that plugs directly into a standard BT telephone wall outlet or extension socket.

Will callers or landline users hear any clicks or noise when I am listening in?

No. The device functions in complete acoustic silence and does not cause signal drops, volume attenuation, or audible clicks on the line during monitoring.

Does the gsm landline bug record telephone conversations internally?

No. The device acts as a live audio transmitter that dials your mobile phone. To record conversations, you can use a call recording app or a Bluetooth Call Recorder connected to your mobile handset.

Will this device work on digital office phone systems or PABX networks?

No. This device is engineered specifically for standard single-line analogue landlines (PSTN/BT lines) and is not compatible with digital or multi-line PABX systems.

Can I leave the gsm landline bug permanently plugged into mains power?

Yes. The unit includes a 240V AC mains charger adapter, allowing it to run indefinitely without relying on the internal backup battery.

Does the device come with a SIM card pre-installed?

No. This model requires you to insert a standard-size 2G/3G/4G compatible SIM card from your chosen cellular network operator before deployment.

How does the gsm landline bug notify me when a call takes place?

When a landline call begins, the internal sensor detects line activity and automatically dials your designated mobile number, allowing you to answer and listen live.

What are the built-in vibration and motion sensors used for?

These optional security sensors can be activated via SMS. If someone moves the device or approaches it, the bug will instantly text or dial your phone to alert you to potential tampering.

• Requires a standard active SIM card (standard size) from a mobile network provider to transmit audio calls to your handset.
• Compatible exclusively with standard analogue single-line telephone sockets; will not function on digital PABX or multi-line business switchboards.
• Must be connected to a live BT wall outlet on the target phone line; best deployed on secondary hidden outlets or via a two-way line splitter for maximum discretion.
• Outbound call-back notifications require active calling credit or a monthly contract plan on the internal SIM card.
• To record intercepted calls, an external mobile call recording accessory or recording app must be used on your receiving phone.

• Dual-function surveillance device for live landline call interception and ambient room audio monitoring.
• Connects directly to any active BT telephone wall socket or secondary extension on the target line.
• Automatic call-back feature dials your designated mobile number whenever an incoming or outgoing landline call is detected.
• Internal microphone captures room acoustic conversation within a 5-metre radius when called directly.
• Operates in total silence without causing line interference, clicks, or signal degradation to landline calls.
• Built-in vibration and IR motion sensors send immediate SMS security alerts if the unit is moved or approached.
• Full remote administration allows settings and notification modes to be changed via simple SMS commands.
• Dual power options support standalone battery operation or continuous deployment via the supplied AC mains adapter.
• Tri-band cellular module accepts standard SIM cards for global monitoring range.

• Device Type: GSM Landline Interceptor & Room Listening Bug
• Line Interface: Standard UK BT Telephone Connector (RJ11 / BT Plug)
• Line Compatibility: Single Analogue PSTN Landlines (Not compatible with digital PABX or multi-line office systems)
• Network Frequencies: Tri-Band GSM Modem (900 / 1800 / 1900 MHz)
• Power Source: Internal 3.7V 580mAh Rechargeable Battery or Continuous AC Mains Power (Adapter supplied)
• Battery Standby Time: Up to 36 hours standby on internal battery power
• Battery Talk Time: Up to 2.5 hours continuous live monitoring on battery power
• Microphone Range: Up to 5 metres (approx. 16 feet) for ambient room audio
• Security Sensors: Integrated vibration sensor and infrared motion sensor
• Dimensions: 62 mm × 40 mm × 20 mm

• GSM Landline Bug Control Unit
• Standard BT Telephone Connection Cable
• AC Mains Power Supply Adapter
• User Guide Information