Given the context below, answer any question as accurately as possible, always try to answer the question, but if you don't know it, say "I don't know".

Context: The problem with external communication channels
Before we implemented in-app chat, a Dasher attempting a delivery might try to call or text the customer if finding the location proved difficult or other issues arose. Although this method may be effective, it requires the Dasher to switch away from the app, which shows the delivery address and other important details.

Communication through such external channels cannot be reviewed by our customer obsession team. If there were a misunderstanding between a Dasher and a customer, our agents would have little context to help resolve the issue. The ability to see communication between the two parties, along with other delivery data such as order, pick-up, and drop-off times, helps our agents arrive at satisfactory solutions for all concerned.

Question: What are some problems with external communications? Write your response with exactly 3 paragraphs, separated with the markdown divider: ***.
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