SMS alerts

SMS alerts for responders who do not run apps

Send a short text-message alert via configured upstream carriers. Acknowledgement via reply-keyword. Cheap, reliable, deliverable anywhere with cell coverage.

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Latency
~6s
Pricing
PAYG · balance
Reach
Any phone

Live preview

DEMO
WardenPoint

CRITICAL Checkout p99 above SLO 5m. Reply ACK NTF-8h2k to acknowledge.

1 segment · 159 chars

When to pick this

When SMS is the right tool

SMS reaches anyone with a phone. It is more expensive than Telegram but cheaper than voice.

Reach

Anywhere with cell coverage

SMS arrives even on a basic feature phone. Useful for field-ops shifts, contractors and external responders.

Backup

Middle escalation step

Use SMS as step 2 — between Telegram (free, fast) and voice call (expensive, loud). It catches users who missed the chat but still have a phone.

Compliance

Recipients without apps

Some teams cannot install Telegram or WhatsApp due to policy. SMS is the safe fallback.

Channel profile

What to expect

Per-segment pricing, carrier delivery proof, and the constraint nobody likes to talk about.

Median latency
~6s

Carrier-side delivery typically adds 4–10 seconds. Regional differences exist.

Cost
PAYG per segment

SMS is billed per 160-character segment (140 with non-Latin alphabet) from your pay-as-you-go balance. No monthly inclusion — top up any time. The dashboard shows the per-region rate.

Delivery proof
Carrier DLR

We capture Delivery Reports from upstream carriers when supported. Stored in the audit log.

Constraint
Reply rate

Reply-keyword acknowledgement depends on the recipient's region permitting two-way SMS. Some regions do not.

Setup

Three steps to first text

Add the phone, fund the credit balance, send a test text.

  1. 1Step 1

    Add a phone in E.164

    Recipients → Add → SMS. Use the country code. The dashboard validates and shows the per-segment rate.

    $ +15550142
  2. 2Step 2

    Ensure credit balance

    Voice and SMS are pay-as-you-go on top of the plan. Top up from Billing → Credits before enabling SMS in production.

    $ Billing › Credits
  3. 3Step 3

    Send a test SMS

    Dashboard → Send test → SMS. The text arrives within a few seconds; reply ACK {'<'}code{'>'} to acknowledge.

    $ Send test → SMS

SMS FAQ

Common SMS-channel questions

Carriers charge per 160-character segment (140 with non-Latin alphabet). Long messages are concatenated by the recipient device but billed per segment by the carrier.
Free plan

Send a test SMS today

Free plan includes a small SMS credit so you can prove the workflow without putting in a card.

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  • Carrier DLR captured
  • Two-way reply ack
  • Pay-as-you-go credits