validate field input is phone number in module contacts

I want validate fields in module contacts but I don't know edit it anywhere. everyone can help me.
Thanks you

Comments

  • edited April 5
    Hi,
    Hope you are doing well. Please let me know if you are still looking for any help in Vtiger CRM . I am here to assist you .

    Kind Regards,
    Vivek Mahatma.
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