“Delivered” is not success: why SMS timing and routing actually define reliability
python
dev.to
Most SMS APIs give you one answer: delivered That sounds like success. But in real systems, it often isn’t. Because delivery is not the problem. Timing is. A message can be technically delivered and still arrive too late to matter. This is where most systems break: OTP codes fraud alerts transaction notifications They are not just messages. They are actions with a time window. If timing fails: the system fails This is the gap most APIs don’t show: API view: send → delivere