A registry has been established for organisations who send text messages to their customers, such as banks, delivery services, insurance providers, to register their sender IDs. he new initiative to help identify scam text messages has been launched today by the Commission for Communications Regulation (ComReg). A registry has been established for organisations who send text messages to their customers, such as banks, delivery services, insurance providers, to register their sender IDs. Application-to-Person messages often contain a Sender ID to indicate where the text message originated (for example, eFlow). Many scam messages will also have a Sender ID that imitates a legitimate service to attempt to appear trustworthy to the recipient.