Website Monitoring SMS Alerts and Uptime Monitoring With SMS Alerts to Every Number

Sign up for an uptime monitoring service that sends SMS alerts, add your website address and enter your mobile number with its country code. The service checks the site every minute or so from its own servers, and when the site fails to answer it sends a text to your phone. On TrackDowntime that text goes out about 60 seconds after the failure and repeats until the site is back.

The part people skip is deciding who else should get it. A text to one person works until that person is on a plane, asleep or in a meeting. List two or three numbers on every endpoint that matters, and make sure at least one of them belongs to someone who can actually restart the server or call the host. If you want the full escalation picture, our phone call downtime alerts page shows how the call and the text work together.

A down alert reads like this: TrackDowntime: Acme Store is DOWN (https://acmestore.com). HTTP 503 since 14:02 UTC. If the site returned nothing at all, it says no response instead of a status code. The recovery text reads: TrackDowntime: Acme Store is back up after 23 min (https://acmestore.com).

Every alert is held to one SMS segment of 160 characters. Long site names are shortened first, the status code and time always stay, and characters a phone cannot show in a standard text, such as emoji in a site name, are dropped. That matters more than it sounds. A text that splits into two parts can arrive out of order or half missing on some carriers, and a message full of question marks tells you nothing at 4 a.m.

Most uptime tools either sell texts as prepaid credits or include a monthly allowance that grows with the plan. The table below shows how the main vendors handle it, read from their own pricing pages in September and October 2026.

To be straight about it, the texts themselves are cheap. Three people getting five texts per outage, two outages a month, is 30 texts, which fits inside most allowances and costs about $4.50 in UptimeRobot's 100 credit pack. Where the metered model bites is the bad night: an endpoint that flaps for hours, alerts that repeat every few minutes, and an allowance or credit balance that runs dry before morning. UptimeRobot's own help center says its auto refill switches itself off without notice when a card payment is declined. Our breakdown of UptimeRobot SMS credits and voice call costs and Pingdom SMS alerts cost guide run the numbers in detail.

Yes. On TrackDowntime you type several numbers into the phone field of an endpoint, separated by commas, and every number gets a text and a phone call on every alert round. There is no per number fee and no notify seat to buy. Different endpoints can carry different numbers, so the client site texts the account manager while the API texts the on-call developer.

Elsewhere it usually costs something. UptimeRobot charges credits for every text to every contact and sells notify seats on Solo as an add-on. Pingdom and Uptime.com subtract every text to every phone from the monthly allowance, so three people on one alert use the allowance three times as fast.

Both, in that order. A text is quiet, readable in a meeting and leaves a record on the phone, which makes it the right first signal during the day. A call is what wakes someone at night, because most phones let calls through Do Not Disturb from favorite contacts while texts stay silent. That is why every TrackDowntime alert round sends both to each number.

Note what that means in practice: there is no texts-only setting today. If a number is on the endpoint, it gets the call and the text. Teams that want a person texted but not called usually put that person on email or Slack alerts instead, which every plan includes.

The usual causes are on the alerting side, not the carrier. The check interval was 5 minutes, so the site was down for 4 minutes before anyone looked. The plan's SMS allowance or credit balance had run out. The alert was set to text only once, and nobody saw that one text. Or the number was saved without a country code and never resolved.

Carrier delays of a few seconds do happen, which is the honest case for pairing every text with a call and a repeat schedule. If the first text is missed, the call at minute 0 and the next round at minute 5 are not.

If one person watches a handful of sites and a single text per outage is enough, you do not need to spend $99. UptimeRobot's Solo plan or Pulsetic's $9 Solo plan, which includes SMS and calls, will do that job for far less. Hyperping's $29 Essentials plan includes calls and 20 SMS credits a month for small teams too. And if you want status pages, keyword checks or checks from several regions, those tools have them and we do not.

TrackDowntime is built for the other case: a business site or API where an outage costs real money, two or three people need to hear about it immediately, and the alert has to keep going until somebody fixes it. Compare the plans on our uptime monitor pricing page, or see how the same alerts work for online stores and checkout pages and agencies watching client sites.