Inclusion Criteria:  Participant is willing and able to give informed consent for participation in the trial. Male or Female aged 18 years or above. Paroxysmal AF with symptoms, Holter recording and/or implantable device evidence of >1 but <15 episodes of AF in the last 3 months. Persistent AF scheduled for repeat cardioversion (i.e. having had at least one prior cardioversion). Currently have an Apple IOS or Android smartphone.  Exclusion Criteria:  Diagnosis of permanent AF. Contra-indications for implantable cardiac monitor. Visual or physical impairment that prevents ability to read and acknowledge smartphone/watch notifications. Unable to comply with the follow-up schedule. Do not have Apple IOS or android smartphone.