If you can contact the previous owner, they can unlock it remotely. They must log in to iCloud Find Devices , select the iPhone 4s, and choose "Remove from Account" .
The DNS bypass method is a "soft" bypass. It doesn't unlock the phone but redirects the activation request to a custom server, allowing you to use apps, browse the web, and watch videos. Restart your iPhone and go to the Wi-Fi selection screen . Press the Home button and select Wi-Fi Settings . Tap the "i" icon next to your Wi-Fi network. iphone 4s activation lock bypass ios 9.3.5
For a more integrated bypass, users often look toward tools that utilize hardware-level exploits. Since the iPhone 4s uses the A5 chip, it is susceptible to certain "checkm8" style exploits, though iOS 9.3.5 is more restricted than earlier versions. If you can contact the previous owner, they
Remove the existing DNS and enter one of the following based on your location: 104.154.51.7 Europe: 104.155.28.90 Asia: 104.155.220.58 South America/Other: 78.109.17.60 Tap Back , then Done , and select Activation Help . It doesn't unlock the phone but redirects the
Before attempting technical workarounds, always try the official channels. These methods are permanent and do not limit device functionality.