Offline APN Database is for international travelers who like saving money on cell voice and data service by using a local SIM card purchased at their destination. The app contains a locally stored database with over 1300 different APN codes for carriers all over the globe. The app will be updated whenever the list is modified.THIS APP DOES NOT UNLOCK YOUR PHONE.However, if you would like an unlock code you can acquire one here:http://unlockscodes.com/cart.php?group=0&service=imei&aid=f0dd4a99fba6075a9494772b58f95280IMPORTANT NOTE:If you find a SIM that does not have a valid APN in the database please email me so we can find the correct settings together. I would like the APN list to be as complete as possible, but I will need help from everyone. Please check against the database using this free version first. If you happen to know the country you are visiting we can try to improve that countries list before you leave. This helps everyone.How does this app save money?Most cell providers charge outrageous fees for international roaming. You can avoid international roaming fees by purchasing a local SIM. In many countries you can get one for less than $10.In order to do this you need a phone that is not carrier locked (this is not the same as rooting). You can get your phone's unlock code and instructions on how to use it from your carrier. Most of the time you can get this over the phone from your service provider.Using a local SIM will give you a local phone number. However, If the purchased SIM card includes data getting an internet connection requires the service providers APN settings. This can be difficult to get if you do not speak the local language.You can learn more about APN settings and how they work here:http://en.wikipedia.org/wiki/Access_Point_NameThis app contains a huge database of known APN settings for SIM cards. Run the app and search for your SIM's APN settings. Then you can add these settings automatically, or in the case of Ice Cream Sandwich users copy and paste the individual settings into a new APN entry.NOTE FOR ICE CREAM SANDWICH AND JELLY BEAN USERS:The current release of Android has disabled the ability to add APN settings with 3rd party software. You will need to use the copy buttons (see the screen shot) and paste the settings into a new APN entry manually. As of now the only way around this limitation requires root access (do this at your own risk) and placing the app in the /system directory.APPLICATION LIMITATIONS:This application will not give your phone signal where it normally will not get it.This application it meant for phones with a GSM antenna. If your phone does not have a SIM slot this application will do nothing for you.My email is provided for support with the application. If you have a GSM phone and have entered a SIM card that was not provided with the phone and the application does not have your APN setting please email me. If you have any other issue please contact your service provider.