When purchasing a SIM card for an intruder or fire alarm, a common mistake is buying an expensive consumer contract with gigabytes of data. So, how much data does an alarm system actually use?
The answer is: incredibly little.
Understanding Alarm Data Usage
Unlike a CCTV camera that streams heavy video files, an alarm system only communicates simple text commands and small “keep-alive” pings.
1. Traditional GSM Diallers (SMS/Voice)
Older or simpler GSM modules don’t use internet data at all. When triggered, they use the cellular Voice network to call a pre-programmed number, or the SMS network to send a text message.
- Requirement: A SIM that supports Voice and SMS, with perhaps a tiny 10MB data allowance just for the panel to check in with the network.
2. Modern IP/App-Controlled Alarms (Texecom, Pyronix, etc.)
Modern smart alarms communicate via IP data to a cloud server, allowing you to arm/disarm the system via a smartphone app.
- Background Polling: The panel sends tiny data packets (a few kilobytes) to the server every few minutes to say, “I am still online.”
- Alerts: When triggered, it sends a tiny push notification packet.
- Total Usage: Even with daily app usage and background polling, a standard smart alarm rarely uses more than 10MB to 50MB of data per month.
The M2M Tariff Advantage
Because alarms use so little data, putting a £10/month consumer SIM in them is a massive waste of money.
Anywhere SIM offers highly specialized, low-cost M2M (Machine-to-Machine) tariffs designed specifically for the security industry. For a few pounds a month, you get a dedicated 50MB allowance combined with the ultimate failsafe reliability of unsteered multi-network roaming.