Can SMS and MMS opens be measured?
An estimated open rate needs an explicitly documented model and uncertainty. Without direct read evidence, the site should describe the available event instead.
Putting the guide into practice
Ask the vendor which event underlies each dashboard label. Prefer a report that names delivered, replied, clicked, and completed actions with clear definitions.
- Underlying event
- Channel
- Observed or inferred
- Reporting label
Limits and review decisions
Do not claim a numerical SMS open rate from a delivery receipt or industry marketing statistic. Other messaging channels may expose different events; they are outside this SMS/MMS build.