Perhaps. It depends on what make and model of phone you have, Telecom Niue network currently does not support Apple devices. If your phone supports, the spectrum bands that we use on our 4G (Band 28) then you do not need to change. If not, then you will need a new phone.
Will the phone come with a Data plan?
What frequency does Telecom Niue Limited 4G use?
Telecom Niue Limited 4G Network uses 700 MHz frequency Band 28.