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An SMS verification flow can work in one country and still fail for users in another. SMS-Act’s August 22, 2026 release argues that overall delivery figures can hide a destination-specific problem, and recommends measuring each market separately and testing the live signup flow on a genuine local carrier line. The release does not document a verified Manila or Jakarta incident, so its proposed causes should be treated as hypotheses to investigate, not established explanations.
How an aggregate delivery rate can hide a local failure
When a service has many successful verifications in an established market, those results can dominate its overall delivery rate. A weaker result in a newly served country may barely shift the total, even if signups there are effectively blocked.
SMS-Act illustrates the point with a rate falling from 93% to 91%. Those figures are an example in the release’s argument, not measurements from a dataset or evidence of a Manila or Jakarta failure. The operational lesson is to calculate results by destination country rather than relying on one blended figure. SMS-Act’s August 22, 2026 release
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Why a verification code might not arrive
SMS-Act lists several possible failure points in a verification flow. The release does not establish that any one of them caused a real incident in Manila or Jakarta; use them as diagnostic questions when a market’s results fall below expectations.
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Carrier filtering or message drops
A provider or aggregator may report that it accepted a message without confirming that the handset received it. The release says a destination carrier could filter or drop a message downstream. This is SMS-Act’s diagnostic explanation, not a conclusion supported there by carrier logs.
Sender-ID or template registration
Check whether the sender ID and message template in use are registered or otherwise configured for the destination route. The release identifies missing registration as a possible cause, but does not document a particular carrier rule or current legal requirement for either country.
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Number-type checks rejecting valid users
A signup form may use a line-type check to decide whether a number can receive a code. Review whether that check is incorrectly rejecting legitimate local numbers, rather than assuming every failed attempt is a delivery problem.
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A route change that went unnoticed
Ask the messaging provider which routes and sender IDs it uses in each country, and whether those changed. SMS-Act names route changes as another possible explanation; the release does not identify a specific provider change tied to Manila or Jakarta.
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How to test the signup flow in each destination market
- Establish country-level monitoring. Break verification attempts and outcomes out by destination country. Set an alert floor for each market instead of relying only on a global delivery rate.
- Run a live test on a genuine carrier line. Complete the actual signup flow using a local carrier line in the market you serve. If staff are physically present, SMS-Act recommends a local prepaid SIM; check that it is eligible for the destination country and carrier before using it.
- Repeat after relevant changes. Test again after changing a messaging provider, route, sender ID or message template. A successful test before a change does not establish that the new configuration works.
- Log verification starts that do not finish. Record attempts that begin but never complete, so abandoned users are visible even if they do not contact support or create an account.
- Ask the provider for route details. Request written confirmation of the routes and sender IDs used in each country, along with country-level reporting and an escalation process for suspected filtering or delivery failures.
- Validate any remote test number. If no local team is available, SMS-Act says a virtual phone number may cover a market for testing. Confirm the number’s type and suitability first; the release cautions that VoIP test numbers may reproduce line-type rejection rather than test SMS delivery.
What to check when a market falls below its own floor
- Compare the affected country’s results with its own baseline, not just the service-wide rate.
- Check whether the provider’s acceptance status is being mistaken for confirmed handset delivery.
- Review sender-ID and template configuration, number-type filtering, and any route changes.
- Use a genuine local carrier line to reproduce the live signup path and record the outcome.
- Escalate with the provider using the country, route, sender ID, template and test details, rather than a blended delivery figure alone.
Keep SMS delivery separate from identity checks
A working one-time passcode only verifies access to a phone number for that step; it does not replace identity checks. SMS-Act notes that document, selfie or national-ID checks remain separate where required. Testing a product’s own signup flow is also not permission to bypass platform terms or other checks.
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