Older versions of Android may have a “Mobile Networks” option instead.
Note: Your plan will need to support mobile data in order for you to enable it. You will also need a cellular signal in order to use your mobile data connection.
Open the Settings app and select “Data usage. Tap the Menu (⋮) button button in the upper-right corner. Check the “Data roaming” box.
You can see your mobile data usage in the “Data usage” menu, but it won’t display your carrier limit.
You can adjust your APN settings by opening the Settings app, and selecting “Mobile networks”, and then tapping “Access Point Names”. On older phones, “Mobile networks” may be located under “More. . . " within the Settings menu.