Treatment/intervention period: Regardless of where patients have been recruited and consented, the patient and/or their caregiver will be trained to use the app in the post-operative, predischarge period; additional training will be provided on how to use the device, as necessary. Notes will be taken to document the success of training and to identify any potential areas for improvement in the training protocol. The study personnel will then explain the protocol for when the patient is discharged home and answer any questions the patient and/or their caregiver may have. Participants will be provided with an iPhone 5, which will be theirs to keep following study completion. Prior to assigning a smartphone to a participant, study personnel will be guided through a process to reset the device and erase any information that was stored on it from the prior user. Participants' names and medical record numbers are encrypted and stored only in the backend app and are never placed on the device.