Answer:
The most appropriate action to take if you have recently changed your mobile number is to update the mobile number in the Infosys Telephone Directory. This will ensure that your new contact information is available to everyone in the organization who needs it. Updating the mobile number in the directory is important because it is the primary source of contact information for colleagues and managers who may need to reach you for work-related purposes. It is also recommended to update your mobile number in the common team folder where the team's contact details are stored so that your team members can also reach you easily. Updating your mobile number on social media is optional and may not be necessary for work-related communication.