Apple's iOS Assistant has an undeniably iconic voice – you know Siri when you hear them. As a memorable voice as it may be, you do not have to stick to its standard American accent. In iOS 11, you can choose between two more vocal deliveries, and iOS 12 adds two more accents for a total of four more.
Since iOS 9, you can choose between American, Australian and British English accents, but with iOS 12 installed on your iPhone, you get Irish and South African accents as options for Siri.
To change Siri's accent, open the settings, tap "Siri & Search" and select "Siri Voice" at Ask Siri . Here you can find all the language options that are available to you. You can choose between [male] or female gender and American, Australian, British, Irish, or South African under accents . Keep in mind that the last two options are only available in iOS 1
If a gender or accent is not already downloaded to your device, each time you tap one, the accent, gender, or both are downloaded. You can check the progress of the language downloads at the bottom of the menu (if you do not see anything, it will be downloaded). Wait for the process to complete before typing elsewhere, unless you have changed your mind.
If you tap one of these options, you can also hear a preview of Siris accent and gender, whether downloaded or not, as long as you've raised the volume (the ring / silent switch does not have to be in ringing mode). Once you know what you want, make sure the accent and gender are highlighted, and that's it.
You can always return to this menu if you want to mix Siri's accent. For example, if the male Australian accent does not do it for you, go ahead and try the South African female voice. You have six different voice combinations for Siri in iOS 11 – ten for iOS 12. Find the best combination for you.
Unfortunately, you can not ask Siri to change his gender or accent. If you try, you can only access the "Siri & Search" settings.