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The simple method is always active and simple simply rejects leads that have a phone number that matches an existing lead in the same campaign.
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You upload a Deduping Campaign in the same manner used to upload any Campaign by selecting but select the 'Create Deduping Campaign' option. The same import rules apply.
There can only ever be one Deduping Campaign for a given Campaign Template. If you upload a second one, it will replace the existing Deduping Campaign so each . Each time you upload a Deduping Campaign it must be a complete list.
Additional details can be found in the Campaign Template help on how to define what is a duplicate lead and the Campaign Template MUST be configured for this to work.
To assist with improve security when you upload a Deduping Campaign the lead details are obscured so that the customers customer's details are not actually stored on the system, but we . We can however still use their details to perform deduplication (we use some clever maths called a one way hash to make this possible).