I just recently signed up for this service. When someone texts me from a blocked number, the text doesn't come through as expected. But the sender does not receive any kind of a message saying the message did not go through. However, my brother signed up for the exact same service and if a blocked number texts his phone, the sender gets a message, in red, stating "Your message did not go through....."
We both have AT&T iPhones. Why does someone texting me from a blocked number not get that message? Thanks.
UPDATE: I just found my answer. The sender has to be using an AT&T phone to get the message.