Which mail-synchronization option on a mobile device is MOST effective for conserving data when you have a limited cellular data plan?
Enable push synchronization with no restrictions
Download headers only
Download full messages, including attachments, automatically
Automatically download attachments larger than 10 MB while roaming
Selecting the option to download headers only transfers just the sender, subject, and other minimal header data during the initial sync. The full message body and any attachments are downloaded only if the user opens the email, so far less cellular data is consumed than with full-message or auto-attachment downloads. Push or unrestricted synchronization moves entire messages (and sometimes attachments) automatically, using more data.
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