如何从地址簿中获取电话号码作为字符串？

我有一个包含联系人姓名的文本字段，我想获取其电话号码：

ABAddressBookRef adressBook = ABAddressBookCreate();

NSArray *people = (NSArray *)ABAddressBookCopyPeopleWithName(adressBook,
                               CFStringCreateCopy(kCFAllocatorDefault, 
                                                 (CFStringRef)recipient));

if((people != nil) && ([people count] == 1)){
    ABMultiValueRef person = (ABMultiValueRef)[people objectAtIndex:0];
    NSString *phone = (NSString *)ABRecordCopyValue(person, 
                                                      kABPersonPhoneProperty) ;
    NSLog(@"%@", phone);
}

我想要电话号码作为字符串，但这给了我更多：

ABMultiValueRef 0x339470 with 1 value(s)
    0: _$!<Mobile>!$_ (0x338c50) - 0177 1647788 (0x339450)

如何仅获取数字作为字符串？

NSMutableArray *phoneNumbers = [[[NSMutableArray alloc] init] autorelease];
ABMultiValueRef multiPhones = ABRecordCopyValue(person,kABPersonPhoneProperty);
for(CFIndex i=0;i<ABMultiValueGetCount(multiPhones);++i) {
    CFStringRef phoneNumberRef = ABMultiValueCopyValueAtIndex(multiPhones, i);
    NSString *phoneNumber = (NSString *) phoneNumberRef;

    [phoneNumbers addObject:phoneNumber];
}