Tip: If you play a game a lot, to pin it to your start screen, in the collection view, selectand hold the game, and select pin to Start.Accept an invitation to play a game1 Sign in to Xbox LIVE.2 Swipe to requests, and select the invitation.3 If you don't have the game, but it is available in your area in Marketplace, you caneither download a trial version or buy it right away.Resume playing a gameWhen you return to a game, there may be a resume icon in the game itself. Otherwise,tap the screen.Maps & navigationPositioning and location servicesAbout positioning methodsYour phone displays your location using GPS, A-GPS, WLAN, or cellular positioning.The Global Positioning System (GPS) is a satellite-based navigation system used forcalculating your location. Assisted GPS (A-GPS) is a network service that sends you GPSdata, improving the speed of the positioning.Wireless local area network (WLAN) positioning improves position accuracy when GPSsignals are not available, especially when you are indoors or between tall buildings.With cellular positioning, the position is determined through the cellular networkantenna your phone is currently connected to.Note: Using WLAN may be restricted in some countries. For example, in France, youare only allowed to use WLAN indoors. For more information, contact your localauthorities.To save on data costs, you can switch A-GPS off in your phone positioning settings, butcalculating your location may take much longer.You can also switch WLAN and cellular positioning off in your phone settings. However,this prevents you from using positioning-related applications, such as Bing Maps.Depending on the available positioning methods, the accuracy of positioning may varyfrom a few metres to several kilometres.The availability and quality of GPS signals may be affected by your location, satellitepositions, buildings, natural obstacles, weather conditions, and adjustments to GPSMaps & navigation 57