Two main types of smartphone apps aimed at dealing with the coronavirus have emerged in centralized and decentralized versions. Both of these apps plan to use Bluetooth technology to alert a user when they are too close to another person and notes the contact. If someone then developed coronavirus symptoms or tests positive, anyone who was in close contact with them is alerted. For the centralized model being developed in the UK, the information regarding the virus is uploaded to a remote server by doctors and other health care professionals. The decentralized model gives the user more control over their information and privacy, allowing them to upload the information. This is the model that Apple and Google are currently working together on to create.