SMS billing vs voice billing: the differences that catch people out

[Alicejames]

Voice is by duration, SMS is per message, and each has its own pitfalls: segmented long messages, delivery status, per-destination prices, and sender ID costs.
Decide upfront whether you bill on submitted or delivered messages, and make sure reports separate voice and SMS clearly. Here’s an overview of SMS billing. How do you handle undelivered messages?