1，效果图

2，样例代码

import UIKit
import CoreTelephony

class ViewController: UIViewController {
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        //获取并输出运营商信息
        let info = CTTelephonyNetworkInfo()
        if let carrier = info.subscriberCellularProvider {
            let currentRadioTech = info.currentRadioAccessTechnology!
            print("数据业务信息：\(currentRadioTech)")
            print("网络制式：\(getNetworkType(currentRadioTech: currentRadioTech))")
            print("运营商名字：\(carrier.carrierName!)")
            print("移动国家码(MCC)：\(carrier.mobileCountryCode!)")
            print("移动网络码(MNC)：\(carrier.mobileNetworkCode!)")
            print("ISO国家代码：\(carrier.isoCountryCode!)")
            print("是否允许VoIP：\(carrier.allowsVOIP)")
        }
    }
    
    //根据数据业务信息获取对应的网络类型
    func getNetworkType(currentRadioTech:String) -> String {
        var networkType = ""
        switch currentRadioTech {
        case CTRadioAccessTechnologyGPRS:
            networkType = "2G"
        case CTRadioAccessTechnologyEdge:
            networkType = "2G"
        case CTRadioAccessTechnologyeHRPD:
            networkType = "3G"
        case CTRadioAccessTechnologyHSDPA:
            networkType = "3G"
        case CTRadioAccessTechnologyCDMA1x:
            networkType = "2G"
        case CTRadioAccessTechnologyLTE:
            networkType = "4G"
        case CTRadioAccessTechnologyCDMAEVDORev0:
            networkType = "3G"
        case CTRadioAccessTechnologyCDMAEVDORevA:
            networkType = "3G"
        case CTRadioAccessTechnologyCDMAEVDORevB:
            networkType = "3G"
        case CTRadioAccessTechnologyHSUPA:
            networkType = "3G"
        default:
            break
        }
        return networkType
    }
    
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }
}

附：手机的数据业务对应的通信技术