Most reliable CPaaS for SaaS providers?

I’m looking into CPaaS (Communications Platform as a Service) tools that are especially reliable for SaaS providers. I want platforms that support voice, messaging, email, and verification APIs with strong uptime, global support, and easy integration into cloud-based apps. Here are some top-rated platforms I found that meet those needs:

• Bandwidth: Bandwidth offers voice, messaging, and 911 APIs with direct-to-carrier access, which means better call quality and fewer outages. It’s a great fit for SaaS apps that need consistent communications delivery in the U.S.
• Telnyx: Telnyx provides voice, messaging, and data services with built-in edge routing. It’s popular among developers for its flexibility, global reach, and competitive pricing.
• MessageBird: This platform supports multichannel communication, including SMS, WhatsApp, and email. MessageBird is trusted by SaaS companies for its global delivery capabilities and easy API integration.
• Kaleyra: Kaleyra offers secure and scalable APIs for voice, SMS, and push notifications. It’s built for large-scale apps and focuses heavily on financial-grade compliance and reliability.
• Telesign: Telesign specializes in messaging and user verification APIs. It’s ideal for SaaS platforms that need to add secure account creation, two-factor authentication, and fraud prevention at scale.

I found these while browsing G2’s CPaaS software category. If you’ve used any of them, I’d love to know how well they held up under load and how smooth the integration was with your app.