I'm trying to create a custom formula field on Activity that looks something like this:

SUBSTITUTE(Phone, '-', '')

However, the syntax checker says the Phone field simply doesn't exist, even though it is part of the Event standard fields.

Is this a limitation? How do I work around it?

1 Answer 1


You can't use the Phone field in a formula. While I couldn't seem to find a specific document that addresses this, there is an Idea you can vote on. We have never been able to use the Phone field on Activity, necessitating additional logic, like triggers, to make this work.

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