You will need to set up the overseas number in the Contact through the App so your Angel Watch can call overseas numbers.
Your Angel Watch included SIM (USA only) even has free calling to 80+ countries including other North American countries like Mexico and Canada!
Please save numbers with the country code preceded with a plus (+) sign.
For example, if you wanted to call family in Mexico, you would enter that contact into the phonebook of the app at +525551231234.