I need an SMS provider for login codes and critical alerts

If you need SMS for login codes and critical alerts, I’d prioritize providers that are reliable, have strong deliverability, support compliance, and offer good APIs.

Good options to consider

• Twilio — very popular, strong global coverage, easy API, good for OTP/login codes and alerts.
• Vonage (Nexmo) — solid global SMS support and developer-friendly APIs.
• Sinch — strong enterprise messaging and authentication use cases.
• MessageBird — good international reach and omnichannel options.
• Plivo — often competitive on price, good API support.
• AWS SNS — simple and cost-effective if you already use AWS, though less feature-rich for auth flows.
• Telnyx — good pricing and programmable messaging, strong in some regions.

What to look for

For your use case, the key features are:

• High deliverability / low latency
• OTP / verification support
• Delivery receipts
• Global coverage
• Fallback options for critical alerts
• Compliance support (A2P 10DLC in the US, sender registration elsewhere)
• Good status monitoring and webhooks
• Strong security controls and audit logs

Practical recommendation

• If you want the safest default choice, start with Twilio.
• If you’re already in AWS and want something simpler/cheaper, consider AWS SNS.
• If cost is a major concern and you can test coverage carefully, compare Plivo and Telnyx.

One important note

For login codes, SMS is convenient but not the most secure option. If possible, also offer:

• Authenticator app (TOTP)
• Push-based MFA
• Passkeys
• SMS as a fallback

If you want, I can also give you:

1. a provider comparison table,
2. the best choice by country/region, or
3. a recommended architecture for OTP + critical alerts.