The new NHS 111 Wales service will launch in the Betsi Cadwaladr University Health Board area at midday on Tuesday June 22.
The easy-to-remember number is free to call from landlines and mobiles and provides access to both GP Out of Hours services and health advice from NHS Wales. It will help patients get the right information, guidance and treatment in the right place at the right time.
North Wales is the latest area of the country to roll out the clinically-led national service.
Callers can receive health advice over the phone, be invited to attend a Minor Injury Unit or arrange an urgent assessment by an out of hours GP or nurse practitioner depending on their symptoms.