A body-mountable electronic device (120, 400) comprising: a motion sensor (122, 430) adapted to detect, during a first phase of a two-phase wakeup mechanism while the body-mountable electronic device is in a sleep state, a deployment indicator comprising an acceleration event indicative of deployment of the body-mountable electronic device; and control circuity enabled by the acceleration event and adapted to: transition the body-mountable electronic device from the sleep state to a wakeup verification state in response to the deployment indicator; and transition the body-mountable electronic device from the wakeup verification state to an operational state in response to verifying, during a second phase of the two-phase wakeup mechanism, that the body-mountable electronic device is deployed onto a body of a user, characterised in that the body-mountable electronic device further comprises: either a biosensor operably coupled with the control circuitry and adapted to detect an analyte, wherein the control circuitry is configured to detect that the body-mountable electronic device is deployed when an electrical current measured across the biosensor exceeds a predetermined threshold value; or a wireless transmitter operably coupled with the control circuitry and adapted to transmit information to a communication device, wherein the control circuitry is configured to detect that the body-mountable electronic device is deployed in response to establishment of a wireless connection between the wireless transmitter and the communication device prior to expiry of a timeout. a motion sensor (122, 430) adapted to detect, during a first phase of a two-phase wakeup mechanism while the body-mountable electronic device is in a sleep state, a deployment indicator comprising an acceleration event indicative of deployment of the body-mountable electronic device; and control circuity enabled by the acceleration event and adapted to: transition the body-mountable electronic device from the sleep state to a wakeup verification state in response to the deployment indicator; and transition the body-mountable electronic device from the wakeup verification state to an operational state in response to verifying, during a second phase of the two-phase wakeup mechanism, that the body-mountable electronic device is deployed onto a body of a user, transition the body-mountable electronic device from the sleep state to a wakeup verification state in response to the deployment indicator; and transition the body-mountable electronic device from the wakeup verification state to an operational state in response to verifying, during a second phase of the two-phase wakeup mechanism, that the body-mountable electronic device is deployed onto a body of a user, characterised in that the body-mountable electronic device further comprises: either a biosensor operably coupled with the control circuitry and adapted to detect an analyte, wherein the control circuitry is configured to detect that the body-mountable electronic device is deployed when an electrical current measured across the biosensor exceeds a predetermined threshold value; or a wireless transmitter operably coupled with the control circuitry and adapted to transmit information to a communication device, wherein the control circuitry is configured to detect that the body-mountable electronic device is deployed in response to establishment of a wireless connection between the wireless transmitter and the communication device prior to expiry of a timeout. a biosensor operably coupled with the control circuitry and adapted to detect an analyte, wherein the control circuitry is configured to detect that the body-mountable electronic device is deployed when an electrical current measured across the biosensor exceeds a predetermined threshold value; or a wireless transmitter operably coupled with the control circuitry and adapted to transmit information to a communication device, wherein the control circuitry is configured to detect that the body-mountable electronic device is deployed in response to establishment of a wireless connection between the wireless transmitter and the communication device prior to expiry of a timeout.