Synchronizing calendar data is critical in a business setting, especially when attending conferences, as schedules tend to be dynamic and knowing where to be at which times is crucial. Calendar data also consumes relatively low amounts of data due to small size of calendar entries. Email, while important, can incur significant data usage due to frequency of emails and potential size of attachments. Therefore, configuring the phone to only download email headers on cellular data, and body/attachments on Wi-Fi, can be a data-saving compromise. Contacts do not typically require immediate syncing post-initial setup unless specific updates are expected. Synchronizing applications often involves transferring large amounts of data and should be limited to Wi-Fi connections.