$alvador
TD Member
"Incumbents can use the terms and conditions of roaming agreements to raise their rivals’ costs such that incumbents are shielded from the full effect of their the rivals’ (i.e., entrants) entry. Making it more costly for entrants to access incumbent networks through roaming agreements is one way for an incumbent service provider to relax competitive pressure."
http://www.michaelgeist.ca/content/view/7061/125/