6 Cellular Preferences
To roam or not to roam? The answer really depends on your cellular provider and your usage. Usually roaming locally doesn’t cost any extra and can greatly improve your experience. You can enable roaming under Settings > Cellular Data Options.
Whatever you do, make sure you contact your cellular provider to get a better grasp at how data roaming works with your cellular data plan. It’s important that you stay within your services’ guidelines, else you can be left with a extremely large bill.
In addition to roaming, you’ll find carrier specific settings such as Wi-Fi Calling and Personal Hotspot under Cellular settings. If you have an iPad or Mac you may even be able to enable calls on other devices (carrier dependent). Here you can also specify which third-party apps can use cellular data or even disable it completely.