The Southwest web site says that for mobile devices and tablets, you need IOS 11 or above for the devices to work properly during a flight. Regarding the app, the app also requires IOS 11 or above, as stated in the App Store. Apps do need to be kept up to date because older versions of the app become less stable / unusable with later IOS upgrades that become released. Assuming you are on at least IOS 11 and the app is up to date, you should be able to use it during your flight. My guess is you are using an older IOS, and that is why you are having problems. --Jessica
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