Select all the candidates whom you want to send bulk text message. This can be done either on Prospects Page or on the Advanced Search page.  
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Click on 'Text message' at the top of the list.
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Text message compose window opens up with a list of all candidates selected.
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Separate text messages will be sent to all the candidates.
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Use 'Add Field' option to personalise the text message. The field value will be automatically replaced by corresponding value on the candidate profile. If there is no field value, the message will not be sent to that recipient and you will be shown a warning.