You can add any mobile and landline numbers to the watch as contact numbers. The watch will also accept 999 as a contact number but we would advise that 999 would not be suitable for a young child or any person who may make calls by accident. You should check with your local emergency service department before adding 999.
Most numbers can be added once the correct number is displayed when this number calls the watch as the watch much recognise the number to allow the call to connect. VOIP numbers may not work where the phone number is not displayed but will work if the number is displayed correctly. To test this you can call your mobile from the number you wish to add to see that the number displays correctly. If you have this number named as a contact in your mobile, call another mobile from the number or remove it as a contact in your phone first to see if the number displays correctly when calling.