We've been testing out SMS sending for a while now, but there's been some concern over traceability of messages sent. To try and help with this, we've now added a "SMS Sending Log" screen available from the Options screen. From there you can see all SMS's you've sent in the last month, and there's also a link to retrieve additional details from our SMS delivery provider, including a detailed log for each message of how it was routed and to what provider.