un-optimized phone number parsing code

phoneUtilities.m

/**
 * Parses a string using the phone's carrier region (when available, ZZ otherwise).
 * This uses the country the sim card in the phone is registered with.
 * For example if you have an AT&T sim card but are in Europe, this will parse the
 * number using +1 (AT&T is a US Carrier) as the default country code.
 * This also works for CDMA phones which don't have a sim card.
 */
- (NBPhoneNumber*)parseWithPhoneCarrierRegion:(NSString*)numberToParse error:(NSError**)error
{
    numberToParse = [NBPhoneNumberUtil normalizeNonBreakingSpace:numberToParse];
    
    NSString *defaultRegion = nil;
#if TARGET_OS_IPHONE
    defaultRegion = [self countryCodeByCarrier];
#else
    defaultRegion = [[NSLocale currentLocale] objectForKey: NSLocaleCountryCode];
#endif
    if ([UNKNOWN_REGION_ isEqualToString:defaultRegion]) {
        // get region from device as a failover (e.g. iPad)
 	NSLocale *currentLocale = [NSLocale currentLocale];
 	defaultRegion = [currentLocale objectForKey:NSLocaleCountryCode];
    }
    
    return [self parse:numberToParse defaultRegion:defaultRegion error:error];
}

#if TARGET_OS_IPHONE

- (NSString *)countryCodeByCarrier
{
    CTTelephonyNetworkInfo *networkInfo = [[CTTelephonyNetworkInfo alloc] init];
    NSString *isoCode = [[networkInfo subscriberCellularProvider] isoCountryCode];
    
	if (!isoCode) {
		isoCode = UNKNOWN_REGION_;
	}
    
    return isoCode;
}

+ (NSString*)normalizeNonBreakingSpace:(NSString*)aString
{
    return [aString stringByReplacingOccurrencesOfString:NON_BREAKING_SPACE withString:@" "];
}