Why Do Servicesubscribercellularproviders Return Nil? (In iOS 12)

why do serviceSubscriberCellularProviders return nil? (in iOS 12)

It's a bug in iOS 12.0.x, and it has fixed in iOS 12.1

CTTelephonyNetworkInfo returning nil on iOS 12

The property serviceSubscriberCellularProviders on CTTelephonyNetworkInfo returns a dictionary of CTCarrier objects keyed by String.

var serviceSubscriberCellularProviders: [String : CTCarrier]?

You can see that in your claimed output: CTCarrier (0x28282e610) {....

How you got that output is unclear as your posted code, while syntax correct, never uses the generated info dictionary variable.

So with correct code (assuming serviceSubscriberCellularProvider is the key):

let networkStatus = CTTelephonyNetworkInfo()
if let info = networkStatus.serviceSubscriberCellularProviders, 
   let carrier = info["serviceSubscriberCellularProvider"] {
    //work with carrier object
    print("MNC = \(carrier.mobileNetworkCode)")
}

But that doesn't seem to work on a single SIM iPhone 7 running iOS 12.0.1. serviceSubscriberCellularProviders is nil. Possibly the newer phones with dual-SIM hardware will react differently.

The deprecated property still works however.

let networkStatus = CTTelephonyNetworkInfo()
if let carrier = networkStatus.subscriberCellularProvider {
    print("MNC = \(carrier.mobileNetworkCode ?? "NO CODE")")
}

Core telephony CTCarrier and isoCountryCode. How to get user's current cellular provider's country?

As the documentation explains:

Note

In this context, the “home” provider is the one with which the user has a cellular plan, as opposed to a roaming provider.

So, you will always get FR, even when roaming, if your home provider is in France.

The reason there are two possible values is that iPhones now support up to two sims; One physical and one e-SIM, so there may be two different cellular providers on a phone.

How can I get details about the device data provider (like Verizon/AT&T) of an iphone programmatically?

You should check the CTCarrier.

Just import CoreTelephony into your Swift file.

Then you can use the carrierName property to get the name of your carrier.

// Setup the Network Info and create a CTCarrier object
let networkInfo = CTTelephonyNetworkInfo()
let carrier = networkInfo.subscriberCellularProvider

// Get carrier name
let carrierName = carrier.carrierName

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