Marketers have over time realized that SMS is a cheap and more reliable method of reaching prospective customers. Similar to email, they have begun to spam us as consumers with junk. Because of this, carriers have begun to implement filtering to block these unwanted messages and just like email, sometimes valid messages get caught by this filter. The key difference between this and email is that you can still look at your spam messages but carrier filtering blocks these messages even before they get to the user’s phone so there is no way for the user to recover them. This is communicated to W2H via a 30007 error code via Twilio.
So, if a message is not delivered to a participant’s cell phone in W2H because of a 30007 error code, this means that the message was filtered out by the participant’s carrier and the patient / participant has not received this message.
We are seeing most of these issues with specific carriers - Sprint, T-Mobile and other smaller carriers using Sprint’s network (such as Boost Mobile).