Write a trigger on Contact to Prevent the user to create duplicate Contact based on Phone if Phone number is already exist on related account in Salesforce | Apex trigger on Contact to do not allow create duplicate contact based Phone number if the contact with same phone exists in related account in Salesforce

Create Apex Trigger →

RestrictDuplicatePhoneOnContactTrigger.apxt [Apex Trigger]

Create Apex Class Controller →

duplicatePhoneOnContactCtrl.apxc [Apex Class Controller]

Final Output → To get source code live demo..

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