networking - Sim card change detection in iOS -


somebody please code sim card detection change in ios on swift.

we have app lets users authenticate phone number , want detect when user changes sim(if app in background) , show alert asking if wants authenticate new number. want detect carrier change of phone.

in appdelegate (didfinishlaunching method):-

    let info = cttelephonynetworkinfo()     if let cellularprovider  = cttelephonynetworkinfo().subscribercellularproviderdidupdatenotifier {         dispatch_async(dispatch_get_main_queue(), { () -> void in             print("notify sim change")          })     }

this not detecting sim card change. doing wrong? please guide.

thanks in advance,


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