This document summarizes a presentation on how over-the-top (OTT) services can increase competition in the mobile market. It discusses characteristics of today's mobile markets, the EU preliminary deal to lower roaming prices, and how OTT players providing mobile VoIP and SMS could enhance competition. It argues that access to mobile numbers is key for OTT providers to effectively compete with mobile network operators (MNOs), and that restricting access only to MNOs violates EU framework principles of non-discrimination, equal treatment, and promoting competition.