For a more stable bypass that allows you to install apps via iTunes (sideloading), you need a computer. The gold standard tool for 32-bit devices is by the development team at r/Jailbreak.
Select "Configure DNS" and enter one of the following addresses based on your location: USA: 104.154.51.7 Europe: 104.155.28.90 Asia: 104.155.220.58 Other: 78.109.17.60 Iphone 4s Ios 9.3.6 Icloud Bypass
You will see websites promising a permanent "IMEI clean" for $10–$30. For a more stable bypass that allows you