When mobile advertising was first introduced,the carriers controlled a lot of the inventory as they limited the amount of traffic that went outside their deck.

Name: When mobile advertising was first introduced,the carriers controlled a lot of the inventory as they limited the amount of traffic that went outside their deck.
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When mobile advertising was first introduced, the carriers controlled a lot of the inventory as they limited the amount of traffic that went outside their deck.

When Mobile Advertising Was First Introduced,the Carriers Controlled a Lot