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Users want a feature that allows them to filter or block incoming spam messages on their VoIP service, as they are charged for each incoming SMS, leading to unnecessary costs.
I have site where users can message an AI assistant through sms. When they run out of credits they will no longer receive messages but I can't stop them from sending messages. One cheeky user spammed my number and im charged for each Incoming sms. Is there any way to guard against this?