i got this from lostpedia.com:
Lost: Missing Pieces is a series of 13 mobisodes/webisodes, available for viewing first on
Verizon mobile phones, and six days later on
ABC.com. Featuring new content that is incorporated into the existing storyline of
Lost, the mobisodes are considered a
canonical extension of the series. Each mobisode fills in a narrative gap somewhere in the
timeline from the first three
seasons. The mobisodes are released weekly, leading up to the
Season 4 premiere, and are between 1:22–3:27 minutes in length.