Mobile Auth

One API. Every channel, picked for you.

Stop hard-coding fallbacks. Mobile Auth reads operator health, country, and device state — then picks the channel that's actually working right now. SNA, WhatsApp, SMS, Voice. We pick. You ship.

Silent Network Auth Primary
SIM-bound verification via the carrier. No OTP, no tap.
WhatsApp FALLBACK
One-tap login over WhatsApp Business.
SMS / RCS FALLBACK
Multi-provider OTP, every operator.
Voice Fallback
TTS code over a call. Universal reach.
99%+
Delivery rate
7s
P90 time to login
120M+
Logins / month
<50ms
Routing decision
How Mobile Auth decides

Every login is a decision. We make it for you.

Mobile Auth reads signals — country, carrier, SIM, device, channel health — and picks the method most likely to log this user in, fastest.

Mobile Auth · live decision Indian fintech user
01 Inputs · per-session signals
country-
carrier-
device-
channel health-
wa supported-
data network-
Mobile Auth · evaluating +0.00s
02 Decision · channel + verdicts
SNA Silent network auth
Vi carrier supports SNA. Recent SNA success rate 96%. Lowest expected time-to-verified.
expected speed~3.8s
expected success96%
Channel pool · per-request verdict
SNA--
WhatsApp--
SMS--
Voice--
Scenarios:
The channel pool

The channel pool, in detail.

Four channels. No hierarchy. Mobile Auth picks the best one per request — but here's what each does, and when it wins.

The feedback loop

Mobile Auth gets smarter with every request.

Every login feeds back into the optimizer. Per-route, per-carrier, per-hour success rates and latencies update continuously.

When a provider degrades, traffic shifts before you even notice. When a new pattern works, it's the new default.

→ Illustrative.
Channel health · India · last 60 min Updating
SNA 95% 62%
WhatsApp 95% 14%
SMS 87% 20%
Voice 82% 6%
Mobile Auth noticed a BSP-2 degradation on WhatsApp (−7% delivery). Routed in-flight to BSP-3. No customer impact.
Customer Outcomes

The numbers our customers ship with.

* Metrics measured against pre-OTPless baselines.

25M+
Logins / month
"OTPless completely transformed how users log in at Meesho — fast, effortless, and frustration-free. Over 25 million seamless logins every month and a 10% boost in conversion."
AV
Arjit Verma
Associate Director · Meesho
94.1%
Login success
"Mobile Auth and one-tap login changed the game — conversions soared to 94.1%, and in just over a week we integrated and scaled to 2M+ logins a month."
Ankit Bhatia · Product Head · Seekho
6M+
Logins / month
Vishesh Upparamani
PM · Classplus
↑2×
Security posture
Lirico Nurcahyadi
Head of Tech · OLX Indonesia
98%+
Login success
"Astrotalk partnered with OTPless to simplify login, reduce operational complexity, and support international scale. Zero-touch flows and intelligent routing delivered measurable impact on conversion, cost, and experience."
Siddharth Singh
CTO · Astrotalk
20×
Lower intl. cost
"OTPless made login effortless for our users and simpler for our team. WhatsApp zero-tap and smart fallback boosted conversions and cut our international auth costs by 20×."
Sagar Gaonkar · CTO · EloElo
Lower
SMS spend
Mudit Yadav
PM · Pickrr (Shiprocket)
Integration

One call. Every channel routed for you.

You don't pick channels. You don't write retries. You don't wire fallback. Mobile Auth makes the decision and returns a verified token.

SignInActivity.kt android · kotlin
import com.otpless.main.OtplessManager
import com.otpless.dto.HeadlessRequest
import com.otpless.dto.HeadlessResponse

// 1. Init the OTPLESS view in your sign-in activity
private val otplessView = OtplessManager
    .getInstance().getOtplessView(this)

// 2. Build the verify request — just a phone number
val request = HeadlessRequest()
request.setPhoneNumber("91", "7069914791")

// 3. Start headless auth — Mobile Auth picks the channel
otplessView.startHeadless(request, ::onHeadlessCallback)

private fun onHeadlessCallback(res: HeadlessResponse) {
    if (res.statusCode == 200 &&
        res.responseType == "ONETAP") {
        val token = res.response.optString("token")
        // → verify token on your backend
    }
}
// build.gradle  implementation 'io.github.otpless-tech:otpless-android-sdk:2.5.3'
onHeadlessCallback · ONETAP
340ms
auths[0] · primary
channelSILENT_AUTH
statusSUCCESS
routedFrom[sna, wa, sms]
verifiedAt1778612141195
routing
decision42ms
countryIN
carrierJio
fallbacksready
device: iQOO I2410 · Android 16 region: in
Frequently asked

Common questions.

What is OTPless Mobile Auth?
Mobile Auth is OTPless's authentication orchestrator. It picks the channel that's actually working right now — based on real-time success rate, latency, and operator health per geography, plus per-user history. One API call returns the fastest path to a verified user.
Which channels does Mobile Auth support?
Four channels as a flat candidate pool: Silent Network Auth (SNA), WhatsApp, SMS / RCS, and Voice. Mobile Auth picks the best one per request and falls back automatically if a channel fails.
How fast is the routing decision?
Under 50 milliseconds. Mobile Auth reads six per-session signals — country, carrier, device, channel health, WhatsApp availability, and data network — and returns a routing decision before the request leaves the edge.
Can I constrain the channel pool?
Yes. Pass a channels array to bias the order or restrict to specific channels — for example, channels: ["sna", "whatsapp"] disables SMS fallback. Most teams let the platform decide.
What happens if every channel fails?
Extremely rare with adaptive routing. When it happens, the SDK surfaces a typed error so you can show a context-appropriate fallback. The user is never silently stuck.
How long does integration take?
About 30 minutes. The SDK supports iOS, Android, Web, React Native, Flutter, and Ionic, plus a plain HTTP API. The same call shape works across all platforms.
Start with Mobile Auth

One call. Every login. Picked for you.

From npm install to live login in 30 minutes. Adaptive routing across SNA, WhatsApp, SMS, and Voice — handled for you.

SOC 2 · ISO 27001 · 500M+ logins / quarter