iOS / CTCarrier on iOS 12

import CoreTelephony

override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.
        textView.text = ""
        
        let info: CTTelephonyNetworkInfo = CTTelephonyNetworkInfo()
        for (service, carrier) in info.serviceSubscriberCellularProviders ?? [:] {
            print("\(service), \(carrier)")
            print(carrier.carrierName!)
            print(carrier.mobileCountryCode!)
            print(carrier.mobileNetworkCode!)
            print(carrier.isoCountryCode!)
            print(carrier.allowsVOIP)
            textView.text.append("Service: \(service), Carrier: \(carrier.description)\n")
        }
    }