Managing Communications to and from a Handset Device Controlling a Therapeutic Product Delivery Device

A communication method of managing communications to and from a handset device controlling a therapeutic product delivery device is described. The method comprises transmitting, to a server, at least part of a unique identifier for a handset device for controlling a therapeutic product delivery device, and patient information regarding a user to be associated with the handset device, and at the server, associating the handset device with the patient information, generating a handset specific code, and transmitting the handset specific code to the user. At the handset device, a manual input of the handset specific code is received, and the future transmission of data from the handset device to the server carried out in association with the handset specific code. In this way, the server can be sure that the user is in possession of the handset (because the user received the code via the secure portal, and was required to manually input it to the handset), and can therefore be confident that communications received in association with that code are associated with the correct user and handset.