WhatsApp for Samsung Ativ S I8750

The Ativ S runs Windows Phone 8/8.1, which Microsoft no longer supports, so the app store and many online services no longer work, but it still functions for calls, texts, the camera, music, and offline use. Treat a renewed unit as a retro or backup device. Before relying on it, do a full reset under Settings > about > reset your phone, and don't expect modern banking or social apps to install. See how others solved this on Reddit

Windows Phone exposes storage only over MTP, not as a normal USB drive, so if the phone won't boot at all you generally can't pull files by plugging it into a PC. If it still powers on, connect it via USB and browse it as a media device in Windows Explorer, or check whether your photos were auto-uploaded to OneDrive (Settings > photos+camera, auto upload). A board that won't power on usually means the data is unrecoverable without specialist hardware tools. See how others solved this on Reddit

Microsoft shut down the legacy Windows Phone 8.x store, so the built-in Store can no longer download or update apps and most listings appear blank. There is no official fix. You can only sideload compatible XAP files manually on a developer-unlocked phone, but for most owners new app installs are simply no longer possible on this device. See how others solved this on Reddit

Windows Phone 8 lets you skip account sign-in during setup, so when the Microsoft account screen appears choose sign in later or skip to reach the Start screen; you can add an account later under Settings > email+accounts. If the previous owner left it locked, factory reset it from Settings > about > reset your phone, or if you can't reach the menus, power off and use the hardware reset by holding Volume Down while powering on and following the on-screen prompts. See how others solved this on Reddit

The phone uses MTP rather than mass storage, so it appears under This PC in Windows Explorer as a media device, not a removable drive letter; open it there to browse Pictures, Music, and Documents. Protected system and app data won't be visible, so plan on copying only your personal media. If the device isn't detected, install the Windows Phone desktop app or update the MTP driver in Windows. See how others solved this on Reddit