I change phone field display format in form management to Unformatted, save, then open again and see Display format: Utited States.
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manage -> forms -> Organization Information -> Phone -> Config -> Display formatno php or mysql errorsOT 1.9.4
Sounds like you found a bug. You should probably report it at github.https://github.com/osTicket/osTicket-1.8/issues/new
I can confirm that, looks definitely like a bug.