White paper | Xperia™ T18 September 20123. Phone Memory (also known as “Data partition” or “/data”) is memory type that is used as workingmemory. It can be compared to the C: drive on a PC or to the startup disk on a Mac. All applicationsdownloaded from Google Play™ or other sources are installed (at least initially) to this type of memory.Some can later be moved to another memory.In this type of memory, as with System Memory, all applications have an allocated area which no otherapplications can access and to where the applications can and usually do save their data (such asphonebook, calendar, notes, and email applications).Phone Memory will tend to fill up as a result of normal use, the use of applications saving their data,and you downloading and installing new applications. Therefore, the larger this memory is from thestart, the more applications you can download and use.If the Phone Memory starts to get full, the phone slows down, and in some cases it might no longer bepossible to install more apps. You should always ensure that you have at least 50 MB of free PhoneMemory. If not, you should consider removing some apps that you seldom use, or move someapplications from the Phone Memory.You can see how much Phone Memory is free under Settings > Storage > Phone memory. You canalso view Phone Memory availability and usage information under Settings > Applications > ManageApplications.4. Internal Storage/SD card (also known as “/sdcard”) is the memory used for:• Content such as photos, movies and music which is added, for example, as a result of the usertaking photos with the camera, downloading media files, and performing file transfers.• Certain applications to store data in cases where larger amounts of content are involved. Forexample, applications for games and maps need to store larger files which would not fit in thePhone Memory.• Applications that can be moved after installation from the Phone Memory. Note that not allapplications can be moved, and in such cases the option to move the particular application will notbe available. Typically, apps running as services, apps with widgets, or apps for live wallpaperscannot be moved. Also note that when apps are moved to the Internal Storage or to the SD cardmemory, a small part of the app will still remain in the Phone Memory.This type of memory differs most between different Android phone models. In some models, a largeamount of internal memory is built into the phone and is referred to in the user interface as “SD card”memory. In other cases, the phone features a memory card slot and a removable memory card that isbundled with the phone. No Android phone can be shipped without this memory type whether it comesas built-in storage or in the form of a removable memory card. The advantage of having an externalmemory card slot is that a user can replace the memory card with a larger one later on. In contrast,built-in internal memory cannot be extended. The drawback for the manufacturer is that a removablecard is more expensive. Therefore, at a certain price level, a manufacturer can offer a larger amount ofmemory if it is built in, everything else being equal.You can see how much Internal Storage is available under Settings > Storage > Phone memory.In the Xperia™ T, the three areas of persistent memory (System Memory, Phone Memory, and InternalStorage), together with some small memory allocations for system operations, share 16 GB of built-ineMMC memory.Note that in some products you may find both a large internal memory and a memory card reader slot.However, on the current Android platform, the card reader slot does not work in the same manner in aphone with large internal memory, for example, a phone with only a memory card slot. Generally, whileyou can access content (such as videos, photos and music) on this optional memory card, you cannot