UIApplication+PhoneCapability. Detects whether the device can actually place a phone call.

UIApplication+PhoneCapability.h

//
//  UIApplication+PhoneCapability.h
//
//  Copyright (c) 2014 Maciej Swic

//  Permission is hereby granted, free of charge, to any person obtaining a copy
//  of this software and associated documentation files (the "Software"), to deal
//  in the Software without restriction, including without limitation the rights
//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
//  copies of the Software, and to permit persons to whom the Software is
//  furnished to do so, subject to the following conditions:

//  The above copyright notice and this permission notice shall be included in
//  all copies or substantial portions of the Software.

//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
//  THE SOFTWARE.

#import <UIKit/UIKit.h>

@interface UIApplication (PhoneCapability)

- (BOOL)canPlacePhoneCall;

@end

UIApplication+PhoneCapability.m

//
//  UIApplication+PhoneCapability.m
//

#import "UIApplication+PhoneCapability.h"

#import <CoreTelephony/CTTelephonyNetworkInfo.h>
#import <CoreTelephony/CTCarrier.h>

@implementation UIApplication (PhoneCapability)

- (BOOL)canPlacePhoneCall {
    if ([[UIApplication sharedApplication] canOpenURL:[NSURL URLWithString:@"tel://"]]) {
        static CTTelephonyNetworkInfo *telephonyNetworkInfo;
        static dispatch_once_t onceToken;
        dispatch_once(&onceToken, ^{
            telephonyNetworkInfo = [CTTelephonyNetworkInfo new];
        });
        CTCarrier *carrier = [telephonyNetworkInfo subscriberCellularProvider];
        NSString *mobileNetworkCode = [carrier mobileNetworkCode];
        if (([mobileNetworkCode length] == 0) || ([mobileNetworkCode isEqualToString:@"65535"])) {
            return NO;
        } else {
            return YES;
        }
    }

    return NO;
}

@end