iPhone dial assist
Is it necessary to have Dial Assist turned on?
iPhone 13
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Well, these are the suggestions about that option:
"Turn on Dial Assist for international calls: (GSM) When Dial Assist is turned on, iPhone automatically adds the correct international or local prefix when you call your contacts and favorites."
At that point it is your discretion to use or not to use that option. There are no particular contraindications.
Regards
Giulio