iClosed team is driven by desire to keep improving your favorite scheduler and unfortunately, downloading invoices for text message costs is something that we don't have available yet.

But, it's something that is definitely one of the top priorities on our Product Improvement list, and you can expect to have this option live soon.
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Until we have it released, please reach out to our Support team via chat button in the bottom right of your screen and we will send you screenshots of the SMS costs.