Add country code to phone number automatically

Question

Does iCloud Contacts have the ability to add the country code automatically in front of phone numbers:
e.g. if a phone number is stored as [phone]; does iCloud have a batch update option where it can convert the number to [phone]; The user may allow this automatically OR ask to be prompted.

Answer 1

Is there a way for me to automatically add the country
code before the phone number for all the contacts
that do not have it?
First, you must have stored somewhere what country each phone number is for. Without this, no automatic method will work.
The obvious place is in the "country" field of each Address Book entry, but keep in mind that you can have multiple addresses & multiple phone numbers for each contact, & it is possible one contact could have addresses and/or phone numbers in more than one country. This makes the problem much more difficult, particularly if there are different labels for different ones of each. (IOW, you could have an "office," a "direct," a "mobile," & a "home" phone, & a "work," a "home" & maybe even a "cabin" or "2nd home" address, not necessarily all in the same country or with an obvious address/phone relationship.)
You also would need to test each phone number to make sure it did not already have a country code entered (to avoid double codes), & some way to mark or otherwise handle entries without a country entry in any address field, with uncertain address/phone relationships, etc.
It is possible to do all this with Applescript, but frankly, even if you already knew a fair amount about scripting, it would probably take you longer to write, debug, & verify the results of applying the script than it would to go through 300 entries by hand, particularly if you use the search box or smart groups to go through the contacts one country at a time.
However, no matter what you try, you can guard against data loss by backing up the Address Book before you start (File -> Backup Address Book) & restoring from the backup if something goes wrong.