You can add a user property: https://confluence.atlassian.com/display/JIRA/Managing+Users#ManagingUsers-Addingapropertytoauser
As mentioned in the docs, it doesn't serve any functionality but you can find the phone number in he profile once it is added.
In the past, Portfolio for Jira required a high degree of detail–foresight that was unrealistic for many businesses to have–in order to produce a reliable long-term roadmap. We're tur...
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