"I'm working on implementing SMS-based verification in a couple of projects, but I've run into some issues."
"On certain devices (especially dual-SIM or custom ROM phones), OTP messages either arrive with a big delay or don't show up at all."
"I've been testing a few providers, and one that worked reliably for me is TrustOtp.app. But I'm still exploring other options and would love to hear what's worked best for you."
SMS-based verification implementations experienced delayed or missing OTP messages on certain devices, notably dual-SIM and custom ROM phones. Delays and non-arrival of OTPs disrupt verification flows and user onboarding. Common mitigations include using third-party verification services, switching SMS provider APIs, or exploring alternative delivery channels. Testing can identify providers with better delivery rates; TrustOtp.app produced reliable results in some tests. Continued evaluation of multiple providers and approaches is necessary to achieve consistent OTP delivery across diverse device configurations and network conditions.
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