iOS how to find country code of the user's phone number?

问题

I have an app that needs to figure out the country code of the phone number the user has. My understanding is that I can't just get the phone number of the user, but, is there a way for example if I have a US phone number to get the country code +1?

I have found multiple answers that claim that using core telephony you can get the country code "+1" but I tried a few and none of them work.

I tried this:

CTTelephonyNetworkInfo *network_Info = [CTTelephonyNetworkInfo new];
CTCarrier *carrier = network_Info.subscriberCellularProvider;
NSString *mnc = [carrier mobileNetworkCode];
NSString *mcc = [carrier mobileCountryCode];    
NSLog(@"country code is: %@, mnc: %@, mcc: %@", carrier.mobileCountryCode, mnc, mcc);

which prints:

"country code is: 310, mnc: 410, mcc: 310"

So, for a US number I would like to get +1.

Is there a way to do this?

EDIT: With further search I found this:

How to map MCC + MNC to users phone country code in iOS objective-C without using Location info?

It might do the trick, but I was looking for a more official way to do this.

回答1:

You can get the country code with:

NSString *cc = [carrier isoCountryCode];

Which will give you US for a USA based device. You can map from country code to country phone code via the JSON data available on this.

来源：https://stackoverflow.com/questions/25095778/ios-how-to-find-country-code-of-the-users-phone-number