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Meenakshi Das 9Meenakshi Das 9 

when i add fax number in fax field click to dial icon displayed left of the number , is it obvious behaviour?

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AbhishekAbhishek (Salesforce Developers) 
When you enter phone numbers in various phone fields, Salesforce preserves whatever phone number format you enter. However,
  • if your Locale is set to English (United States) or English (Canada), 10-digit phone numbers and 11-digit numbers that start with “1” are formatted as (800) 555-1212 ( Example number)when you save the record.
  • If you do not want the parentheses-space-hyphen formatting ((800) 555-1212) for a 10- or 11-digit number, enter a “+” before the number. For example: +49 8178 94 07-0.
If your 10- and 11-digit phone numbers have Salesforce’s automatic format, you might need to enter the parentheses when specifying filter conditions. For example, the Phone starts with (415).
Reference: https://help.salesforce.com/articleView?id=basics_understanding_values_curr_date_phone.htm&type=5

However, you can REGEX to format it:

https://stackoverflow.com/questions/3813195/regular-expression-for-indian-mobile-numbers

https://developer.salesforce.com/forums/?id=906F0000000fyX7IAI

I hope it helps you.

If it helps you and close your query by marking it as solved so that it can help others in the future. It will help to keep this community clean.

Thanks.
 
Malika Pathak 9Malika Pathak 9

Hi Meenakshi Das

It is a Standard Behavior of Fax field but the icon is not compulsory if you not want to use the fax auto-dial click functionality you have to create a custom field and disable or hide the standard field of fax.

I hope that helps you. If it helps you and closes your query by marking it as solved so that it can help others in the future. It will help to keep this community clean.

 

If you find this helpful mark it as the best answer.

thanks, Regards
Malika Pathak