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 shows your location on the map using GPS, A-GPS, Wi-Fi, or cellularpositioning.GPS The global positioning system (GPS) is a navigation system thatuses satellites to work out where you are.A-GPS The Assisted GPS (A-GPS) network service retrieves locationinformation using the cellular network, and assists GPS incalculating your current location.Wi-Fi Wi-Fi positioning improves positioning accuracy when GPS signalsare not available, especially when you are indoors or between tallbuildings.You can also switch Wi-Fi and cellular positioning off in your phonesettings.Cell ID With network (cell ID) based positioning, your phone locates youthrough the cellular system your phone is currently connected to.A-GPS and other enhancements to GPS may require transferring small amounts ofdata over the cellular network. If you want to avoid data costs, for example whentravelling, you can switch the mobile data connection off in your phone settings.The availability, accuracy and completeness of the location info depend on, forexample, your location, surroundings, and third party sources, and may be limited.62 Maps & navigation