Inbound SMS Phone Numbers Block
This block can help answer the question "Why did an inbound text from some seemingly random number get associated with this case?"
Placed on a case profile it will display all "SMS" numbers (numbers someone texted to from the case).
Placed on an auxiliary form, observe the "+" and "-" buttons that do what you would expect and hope. If someone texted from a case to 555-555-1212 and you no longer want inbound texts from that number going to that case, delete it.