Scam!
This "app" is compete garbage. It is nothing more than a list of vague and useless instructions, asking you to do things that dont exist. The description claims that it came port sms messages via email, but that is not even mentioned in the instructions. Its a lie and a literal scam. Their app support number goes to voicemail. Im calling my bank and declaring fraud for the $2 I paid.
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Export Texts, SMS - Secure Text & Message Exporter