Through my research I have found the following codes that when entered into the Bonus code section of the application have produced credits to purchase maps or have provided free guides to the cities listed below: Codes for credits: vayama- 5 point credit wizzair- 2.5 point credit tripping- 6 point credit croft- 5 point credit routesconference- 5 point credit Codes for City Guides: Shanghai- code is shanghai Debrecen- code is debrecen Cairo- code is cairo London- code is usateam Don't know what PocketGuide is or how it can help guide your travels on the ground? Check it out at http://pocketguideapp.com. List of cities that have guides can be found here: http://pocketguideapp.com/en/city/map Rather than start a referral conga for the app, please post any free guides or partner credits you come across. Happy Travels! About PocketGuide: PocketGuide Audio Travel Guides are a collection of audio tours of the best locations and insider hangouts in the world’s major cities and tourist destinations. With different thematic tours available in 78 destinations worldwide, the GPS-based app automatically informs you when an interesting site is nearby. All tours are developed by the knowledgeable local tour guides who help you travel to see all the top sites. This intuitive application guides you with voice navigation and fits comfortably in your pocket. Once the guide is downloaded, PocketGuide works without roaming charges or WiFi connection.