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GSM & WiFi Alarm Dialler and SMS Sender for Fire/Burglar Alarms Cloud Dialer


Our Cloud Alarm Diallers are connected directly to a data centre telecoms service. When an alarm event is triggered, all calls and messages are performed all at the same time by the cloud. As a cloud dialler, the SIM only version is not restricted to just one network and can pick the best available network at the time. It allows for a much higher level of reliability and security than a traditional dialler and is easier to program as you program the numbers into a website on the internet instead of sending your dialler SMS messages.

What is a Cloud Dialler?

 Demonstration of a WiFi performing concurrent dialling

Setting up WiFi on a WiFi only model


The Alarm Dialer is ideal for use in Burglar or Fire Alarms as a universal fit cell phone Auto-Dialer/SMS Message Sender with email. With 2 inputs both the intruder alarm bell and set/unset status can be monitored. Similarly on fire panels the fire alarm bell and fault output can be monitored. By default alarm activation on input A triggers SMS messages and telephone dialling. Set/unset or fault activation on input B triggers emails sending which is free.

The messages are user customisable and will be read out during a telephone call. The system can call and text an unlimited number of users.

The GSM Only unit comes complete with a low cost, PAYG, any network SIM and allows remote home/business security monitoring without a phone line. The GSM only version comes with £5 free credit.

The WiFi only version allows SMS messages to be sent and calls to be made to any landline or mobile phone without requiring a SIM card to be fitted. Calls and messages are made via the cloud and the device uses your home or business WiFi for connectivity without recurring monthly costs (call/SMS charges apply). The WiFi version comes with £1 free credit

The GSM & WiFi version is supplied without a SIM card and can be used with any network other than 3Mobile. The unit has an additional WiFi connection to fall back on for times when the network or SIM card is inoperable. In this case SMS messages and calls are made by our server (call/SMS charges apply; this only occurs when the GSM section is in fault status i.e. no SIM, no network, no credit etc...). This version operates like a traditional dialler using your SIM unless there is a fault at which point it reverts to behaving like the WiFi cloud dialler giving you the best of both worlds.

Setup is performed using a web-browser on any internet enabled device including Smart Phones, PCs, Macs and tablets. If your device has a web browser like Chrome, it can be used to set up the system.

The Live Screen for your device displays your current account balance and can be topped up by £5, £10 or £20 by using the Paypal button. On the GSM only unit, which is supplied with a SIM, your balance will be deducted £1.99 each month to cover the SIM card network connection costs (this does not apply to the WiFi only dialler which doesn't have a SIM). Email messages are always free (ideal for set/unset messages). Alarm SMS and calls costs are displayed below.

The PCB features indicator LEDs to help identify problems such as low signal or network faults.

The SIM Fault LED lights if the device cannot use the SIM; check the orientation of the SIM and remove all PIN numbers or set them to 0000
The No Signal LED lights when no GSM signal can be found; check the aerial is fitted correctly. The LED will flash when the signal strength is less than 11. Keep the aerial away from wires and metallic surfaces.
The Network Fault LED lights when there is a problem with the network service.
Please note the board is supplied with a suitable antenna and 10cm SMA cable only.


All GSM PCBs are supplied with a quad band stub antenna and a PCB to aerial connector cable (~15cm long).  Antennas should be mounted outside of metallic enclosures.  The PCB connector is a U.FL connector and the aerial connector is a standard GSM SMA connector shown below (should an extension cable be required).


SMA Conector for use with GSM Alarm Dialer


Our optional sticky backed antenna makes installation quick and simple however this can only be mounted on non-metallic thin surfaces.  Various antennas are available from our wesbite - please see 'Accessories'. 


For indoor appplications the PCB fits into the Hammond 1591B enclosure.



Standard Call and SMS Pricing (WiFi & GSM):


£0.15 per message (UK, US*, AU + EU Mobiles)

£0.15 per call (UK, US*, AU + EU Mobiles and Landlines)


Set/Unset/Fault emails are free


WiFi only for US market. GSM products do not work in the USA.



SIM Card Pricing (GSM units only):


£1.99 per month (throughout Europe)

£10.00 Bulk Purchase for 120 SMS/Calls available - 8.3p per call/message



Why do we provide a SIM?

We've been making alarm diallers and supporting them for 10 years so we've learned a lot about the pitfalls of using mobile SIM cards to keep your alarm connected. There are many long term reliability problems using ordinary mobile phone SIM cards which are designed for phones and not always-on security equipment.

PAYG SIMs are ineffective in alarm diallers primarily as they will not be able to warn you when they run out of credit or, as is more common, they are disconnected because the minimum top up requirements have not been met. Most support calls we receive are traced back to a problem with PAYG SIM cards.

Contract SIMs are better in alarm diallers as they're likely to prove reliable so long as the bill is paid. However, even the cheapest contracts are unnecessarily expensive when they're not likely to be used very often. They also restrict you to just one network which compromises the reliability of your equipment. We frequently find localised cell faults on one network stopping our diallers working; a problem that doesn't occur using a roaming IoT SIM.

We've been able to make use of a new class of 'IoT' SIMs with our latest generation of alarm diallers.  They can roam on any available GSM network so are not restricted to one provider unlike a mobile phone SIM. As they have no number we use a data connection directly to our telecoms provider to send the messages and make the call. Calls can be made to all numbers at once as it is not the individual dialler doing the calling and messaging. There is also the added advantage that the message can be read out during a call. Once the dialler is triggered it can be destroyed by an intruder and you will still receive a call as it's not the dialler physically making the call.

We work on a PAYG basis and can de-activate a SIM temporarily and can re-activate it later. We're able to support diallers with our SIMs a lot better as we have full access to your individual connection from SIM to dialler. Our SIMs can roam on any network vastly increasing their reliability. We can even pick and chose which networks they can use if there is a problem with one of your networks locally.

Of course the major benefit is that we do not cut you off without telling you the moment your credit expires. If your balance is negative, you will automatically be sent an SMS and email telling you - something a dialler cannot do if its mobile phone SIM runs out of credit. If you no longer require the dialler or you would like to temporarily stop using it, it's a person that switches off the SIM not just a computer in O2/Vodafone/EE etc... We are notified of negative balances and we will contact you to confirm you no longer require the SIM before switching it off. It makes considerably more sense to let our computer monitor your SIM rather than you manually remembering to check your balance every few months.


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