Landline vs Cellular Alarm Monitoring: Which Connection Should You Trust?

How the two connection types differ

The connection type is about how your alarm panel reaches the monitoring center when a sensor trips. It is a separate decision from which sensors you buy or whether a human answers the alarm.

A landline system sends the alarm signal over your home phone line. This was the standard for decades, and it still works, but it has one structural weakness: the signal path is a physical wire on the outside of your house. If the line is cut, whether by an intruder or a storm, the panel has no way to call for help. Alarm Relay, one of the few national monitoring companies that still publishes a landline plan, describes its landline tier as the most affordable option and states plainly that it is vulnerable to line cuts.

A cellular system has a built-in cellular radio, like a phone without a handset. There is no wire to cut, and it does not depend on your home internet staying up. Alarm Relay describes its cellular tier as using a dedicated cellular communicator that operates independently of your phone and internet lines. This is why the industry has converged on it. Modern DIY panels bake a backup path in: SimpliSafe publishes that its system is Wi-Fi connected with built-in network backup and up to 24 hours of battery, and every Ring Protect plan includes cellular backup for the Ring Alarm system.

What about the other big brands? The clearest published side-by-side comes from ADT, which lists itself as offering cell, broadband, and landline monitoring while listing Ring, Brinks, Vivint, and SimpliSafe as cellular and broadband only. That is a competitor characterizing its competitors, so treat it as ADT's claim rather than as those companies' own statements. We could not find a page on Ring's or SimpliSafe's own sites that addresses landline monitoring one way or the other, so the honest summary is that neither markets a landline option and ADT's comparison asserts they do not offer one.

A third path, broadband (internet) monitoring, sits between the two: Alarm Relay describes it as using your broadband connection for faster, more reliable signal delivery than a phone line, and prices it in the middle. It still fails if your internet or power goes out and the equipment has no backup.

What each option costs, by published pricing

Few providers still publish a landline price at all. Here is what is published, as of August 2026:

Two things stand out. First, the landline discount is real but small in absolute terms: at Alarm Relay the gap between landline and cellular is $11 per month, or $132 per year. Second, at the big national brands the connection type is no longer a menu choice. SimpliSafe and Ring simply ship equipment with a built-in backup path and price the monitoring plan, not the connection.

Note also that SimpliSafe's published wording is "built-in network backup," not "cellular backup." It does not specify the technology on its monitoring page, so we do not describe it as cellular.

If you are comparing full monthly costs across providers, our home security cost per month breakdown covers the whole bill, not just the connection type.

Which one should you choose?

Choose cellular if you are buying anything new. Every mainstream system sold today either runs on cellular or includes a built-in backup path, the monthly premium over landline has shrunk, and it removes the cut-line failure mode entirely. It also works in homes that no longer have a copper phone line, which is most homes.

Consider landline only in a narrow case: you already have an active landline, you already own a compatible wired panel, and squeezing the monthly fee matters more than cut-line risk. In that case a third-party monitoring company like Alarm Relay can take over an existing panel for $8.95 per month (billed annually, as of August 2026), which is among the lowest published monitoring prices we have found. Our cheapest professional monitoring guide covers more of these takeover options.

One warning for landline holdouts: many phone lines today are VoIP lines from a cable company, not true copper. VoIP dies with your power and internet, which quietly removes the one reliability property a real landline had. If your line is VoIP, the case for landline monitoring mostly evaporates. Alarm Relay's own landline listing tells buyers to call and confirm telco compatibility first, which is a good sign of how much variation there is.

If you decide professional monitoring is right for you and want to see what cellular monitoring would cost for your specific home, our short questionnaire at /quote fetches real quotes from professional monitoring providers.