Detecting whether or not device support phone calls?

Question

Is the below code reliable to be used to determine whether a device can support phone calls or not? My concern is if apple changes the iphone string to anything else let\'s

Answer 1

Based on @the-guardian's response, I have come up with the following (in swift):

import CoreTelephony

/**
 Indicates if the device can make a phone call.

 - seealso: [Source](http://stackoverflow.com/a/11595365/3643020)

 - returns: `true` if the device can make a phone call. `false` if not.
 */
final class func canMakePhoneCall() -> Bool {
    guard let url = URL(string: "tel://") else {
        return false
    }

    let mobileNetworkCode = CTTelephonyNetworkInfo().subscriberCellularProvider?.mobileNetworkCode

    let isInvalidNetworkCode = mobileNetworkCode == nil
        || mobileNetworkCode?.count == 0
        || mobileNetworkCode == "65535"

    return UIApplication.shared.canOpenURL(url)
        && !isInvalidNetworkCode
}

This code has been tested on an iPad Air 2 Wifi, an iPad Air 2 Simulator, an iPhone 6S Plus, and seems to work appropriately. Will determine on an iPad with mobile data soon.