The number of Swisscom mobile lines remained virtually unchanged year-on-year at 6.6 million (+0.4%). The number of postpaid lines rose year-on-year by 90,000, while the number of prepaid lines fell by 65,000. Here too, there is clear evidence of increasing market saturation. However, Swisscom managed to keep its mobile telephony market share essentially stable. Swisscom will introduce new functionalities for the mobile phone network in 2018 with the Rich Communication Suite. This will make communication easier and more varied, allowing customers to exchange content before the call and also to share pictures, videos or locations during the call. The demand for mobile data services remains high: in 2017, around 55% more mobile data traffic was transmitted compared with the prior-year period. Mobiles are increasingly being used to surf the web outside of Switzerland, too, Year-on-year, data traffic generated abroad grew by 74%, while voice traffic grew by 5%. Around three quarters of roaming data volume was no longer billed to residential customers since it was included as part of the mobile service. Constant price reductions and inclusive services impacted the 2017 results by around CHF 50 million.