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phone number validation / preventing invalid phone numbers being entered into a form

Question asked by 114b26ffeebb121d4dd6c14c0c3b0c4bceeeeb04 on Mar 7, 2014
Latest reply on Mar 18, 2014 by 43922

     Has anyone come up with a way to prevent their Marketo forms from allowing invalid or dummy phone number. For example, I would love to prevent a user from entering one of the following types of invalid/dummy phone numbers:  123-456-7890, 987654321, 1111111111, 3333333333, 5555555555 as well as non-numberic values. If anyone has found a way to do this within Marketo, I would appreciate any suggestions.