This is the second year that Orange has run the competition, which asks players to guess which part of the field a real bull will be standing in at 3pm each day.
Players can watch the bull, named Winston, between May 27 and June 13 via a number of cameras positioned in and around a secret paddock in the UK.
allows users to track Winston's hoof steps and view his highlights from the day. A farmer will give helpful tips on Winston's daily routine plus there will be some entertaining video commentary from the field.
More than 150 people could win tickets to Glastonbury if they guess the correct spot where Winston decides to rest at 3pm.
Contestants can play as a team to increase their chance of winning more tickets.
Hattie Magee, head of partnerships at Orange, said: "Following the success and great participation with the Spot the Bull site in 2007 we felt it was right to bring it back for 2008.
"We believe that Glastonbury is at its best as a shared experience and as such festival goers will have the chance to win up to 8 tickets to head off for three days of festival madness."
Orange is the official telecommunications partner of Glastonbury, which this year takes place from June 27-29 at Worthy Farm, Pilton, Somerset.
Headline acts include Jay-Z, Amy Winehouse, Kings of Leon and The Verve.
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