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You can view how many responses you’ve had to your Keyword by selecting the quick stats:
You can also run an export - Data & Reporting > Export > New Query > IN BLUE - select opt-ins or page selected in Keyword > Supporter Data tab > IN GREEN - Supporter Creation Date > choose date/range > In the report you should see an email formatted like this: 12476921234@smsnoaddress.ea. This is the phoneNumber@smsnoaddress.ea the text came from.