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Dual cell signals On models with Dual SIM, the upper row of bars indicates the signal strength of the line you use for cellular data. The lower row of bars indicates the signal strength of your other line.
Go to Settings > Wi-Fi and make sure that Wi-Fi is on. Tap the name of your Wi-Fi network to join. A blue checkmark beside a network name means that you're connected.
Swift
UIApplication.sharedApplication().networkActivityIndicatorVisible = true
Swift 5 , Swift 4.x , Swift 3.x
UIApplication.shared.isNetworkActivityIndicatorVisible = true
Update for iOS 13, 14
There will be no network indicator displayed from iOS 13.
The deprecation message says:
Provide a custom network activity UI in your app if desired.
[[UIApplication sharedApplication] setNetworkActivityIndicatorVisible:YES];
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