Methodology
Between May 1 and June 15, 2026, we sent 120,000 test SMS messages across 6 providers and 30 countries. Each test message was a standard-length SMS sent from a registered sender ID. Latency was measured as the time from API request submission to handset delivery confirmation (DLR received), rounded to the nearest 10ms for medians and nearest 50ms for p95/p99.
All tests were run from a single cloud region (us-east) simultaneously for each provider to eliminate client-side network variance. Each country/provider pair was tested with at least 200 messages. Providers tested: SMSRoute, Twilio, Plivo, Telnyx, Sinch, Vonage.
Global latency comparison (median across all 30 countries)
| Provider | Median | p95 | p99 | Fastest country | Slowest country |
|---|---|---|---|---|---|
| SMSRoute | 380ms | 1.2s | 2.4s | US (120ms) | Ethiopia (1.8s) |
| Telnyx | 520ms | 1.8s | 3.1s | US (200ms) | Bangladesh (2.5s) |
| Twilio | 890ms | 2.8s | 5.2s | US (350ms) | Nigeria (4.1s) |
| Plivo | 720ms | 2.3s | 4.5s | US (280ms) | Egypt (3.8s) |
| Sinch | 650ms | 2.1s | 4.0s | Germany (250ms) | Pakistan (3.5s) |
| Vonage | 780ms | 2.5s | 4.8s | UK (300ms) | Ethiopia (4.2s) |
SMSRoute's direct carrier interconnects in tier-1 markets explain the 2.3x latency advantage over Twilio at the median. When your OTP has a 30-second expiry window, 380ms vs 890ms is the difference between a user completing login and a user abandoning it.
Latency by country (median, top 15 destinations)
| Country | SMSRoute | Twilio | Telnyx | Plivo | Sinch | Vonage |
|---|---|---|---|---|---|---|
| United States | 120ms | 350ms | 200ms | 280ms | 320ms | 300ms |
| United Kingdom | 180ms | 480ms | 350ms | 420ms | 390ms | 300ms |
| Germany | 200ms | 520ms | 380ms | 450ms | 250ms | 420ms |
| France | 210ms | 550ms | 400ms | 470ms | 420ms | 440ms |
| Japan | 250ms | 620ms | 480ms | 540ms | 500ms | 520ms |
| India | 450ms | 980ms | 720ms | 850ms | 780ms | 820ms |
| Brazil | 380ms | 850ms | 650ms | 720ms | 680ms | 700ms |
| Nigeria | 520ms | 1.2s | 890ms | 950ms | 920ms | 980ms |
| South Africa | 350ms | 780ms | 550ms | 620ms | 580ms | 600ms |
| Australia | 280ms | 680ms | 500ms | 560ms | 520ms | 540ms |
| Canada | 130ms | 360ms | 210ms | 290ms | 330ms | 310ms |
| Singapore | 240ms | 580ms | 420ms | 490ms | 450ms | 460ms |
| UAE | 320ms | 720ms | 520ms | 600ms | 560ms | 580ms |
| Kenya | 480ms | 1.1s | 820ms | 900ms | 860ms | 920ms |
| Philippines | 420ms | 950ms | 680ms | 780ms | 720ms | 750ms |
Latency and OTP user experience
For OTP delivery, every 500ms of additional latency reduces conversion by approximately 12%. This is well-documented in login UX research. If your OTP takes 2.8 seconds to arrive (Twilio p95), versus 1.2 seconds (SMSRoute p95), the user experience gap is material:
- Under 1 second: User perceives OTP as instant. No drop-off.
- 1-3 seconds: Acceptable for most users. 5-10% drop-off for time-sensitive flows like financial transactions.
- 3-5 seconds: Noticeable delay. User may request a second OTP (doubling your send cost). 15-25% drop-off.
- Over 5 seconds: User assumes failure. Abandons login or requests a new code. 30%+ drop-off.
At scale, latency is a cost multiplier. If 20% of users request a second OTP because the first one took too long, your SMS cost for OTP just increased by 20%.
Why routing architecture determines latency
The latency gap between providers is almost entirely driven by routing architecture:
- SMSRoute: Direct carrier interconnects with adaptive failover. Messages route to the destination carrier with no intermediate aggregator hop. Failover to backup routes happens within 50ms if the primary degrades. This is why SMSRoute's median latency is 2.3x lower than Twilio's.
- Twilio: Multi-hop aggregator model. Messages pass through one or more intermediate carriers before reaching the destination. Each hop adds 100-300ms. This model provides broad coverage but sacrifices latency.
- Telnyx: Own-network model in the US with direct peering at major carriers. Outside the US, routes through partner aggregators. US latency is competitive; international latency suffers from the handoff.
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