How can whatsapp know country code upon first run on iphone

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闹比i 2020-12-28 19:43

When I first install whatsapp on iphone, when I open it, the first screen already knows my sim cards location and shows the country code. How does whatsapp know this ? As ap

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南笙 (楼主)

2020-12-28 20:10

My two cents :-) using Swift 3

Note: this method will work even if user is not having a sim in iPhone.

Create a new Property List file IntlDialingCodes.plist and paste following lines:

Paste following class or just getDialingCode method in your Helper class, remember to import CoreTelephony:

import Foundation
import CoreTelephony

class Helper {

    static func getDialingCode() {
        let countryCode = CTTelephonyNetworkInfo().subscriberCellularProvider?.isoCountryCode ?? Locale.current.regionCode!
        let path = Bundle.main.path(forResource: "IntlDialingCodes", ofType: "plist")!
        let dict = NSDictionary(contentsOfFile: path)!

        if let dialingCode = dict[countryCode.lowercased()] as? String {
            print("Dialing code for \"\(countryCode.uppercased())\" is \"+\(dialingCode)\"")
        } else {
            print("Dialing code for \"\(countryCode.uppercased())\" not found in plist file")
        }
    }

}

Usage:

Helper.getDialingCode()

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