This here script fixes phone numbers in Mac contacts to include international prefixes. Good when you move elsewhere.

intl_contacts

on findAndReplaceInText(theText, theSearchString, theReplacementString)
	set AppleScript's text item delimiters to theSearchString
	set theTextItems to every text item of theText
	set AppleScript's text item delimiters to theReplacementString
	set theText to theTextItems as string
	set AppleScript's text item delimiters to ""
	return theText
end findAndReplaceInText

tell application "Contacts"
	repeat with eachPerson in people
		repeat with eachNumber in phones of eachPerson
			set theNum to (get value of eachNumber)
			if (theNum does not start with "+" and theNum does not start with "00" and theNum does not start with "44" and theNum starts with "0") then
				set thePhoneNumber to (get text 2 thru (length of theNum) of theNum)
				set nmbr to my findAndReplaceInText(thePhoneNumber, " ", "")
				--log "+44" & nmbr
				set value of eachNumber to "+44" & nmbr
			end if
		end repeat
	end repeat
	save
end tell