If the app expires (usually weekly), you must reinstall it using your computer. Steps to Jailbreak with Phoenix (Mac/PC): Download: Get the Phoenix 6 IPA file and Sideloadly.
On your device, go to Settings > General > Device Management and trust your Apple ID. Phoenix Jailbreak
Choose "use provided offsets." If the device restarts and Cydia does not appear or crashes, open Phoenix again and tap "Kickstart Jailbreak". If the app expires (usually weekly), you must
Open the app, tap "Prepare For Jailbreak," and "Accept". Choose "use provided offsets
The Phoenix Jailbreak is a semi-untethered solution designed specifically for running iOS 9.3.5 and 9.3.6 . It is the definitive way to bring new life to older hardware like the iPhone 4S, iPhone 5/5C, iPad 2, 3, 4, iPad mini (1st Gen), and iPod touch 5G. Key Aspects of the Phoenix Jailbreak:
The jailbreak deactivates upon device restart, requiring you to reopen the Phoenix app to reactivate it.
Can be done without a computer by downloading the Phoenix IPA directly from its website.