​In order to carry out digital tracking and follow-up care at the community level, inbound passengers are required to have a phone number of a telecom service provider in Taiwan (a SIM card can be purchased at the airport of arrival in Taiwan) and to use their personal mobile phone (1 person, 1 phone) to make the health declaration. However, under special circumstances (for example, the passenger is a child under 12 years old) and when the passenger will undergo home quarantine with another person in the same location, they can complete the health declaration through a shared mobile phone.