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Here are the pricing pages for two services that I looked into as possible alternatives to Twilio:

https://www.plivo.com/pricing/

https://www.nexmo.com/products/sms/

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I use both of these services and Flowroute https://www.flowroute.com/pricing/pricing-sms/- Flowroute's pricing is really competitive.

Nexmo has great analytics that show failures. Plivo will just fail and not log it and not return a failure, so I'm migrating away from them.