1. It needs electricity. After jailbreaking, the system will always keep some processes in jailbreaking state. Depending on the number of installed system-level software (deb format), in some cases, the power consumption speed will increase by about 10% ~20% after jailbreaking.
2. This may lead to system instability. With high system authority, we are also in danger of system crash.
3. When the new mobile phone firmware version comes out, don't update it in time unless you back up SHSH with iFaith or tiny umbrella. Because every new version of firmware will fix the jailbreak vulnerability of the previous version, jailbreak will be invalid. And Apple's iOS firmware can only be upgraded, not downgraded. Therefore, if you still need to maintain the function after jailbreaking, it is best to wait until the new jailbreaking program is released, and then formally upgrade the corresponding mobile phone firmware version.
4. There is a small bug in the process of jailbreak, but it has no effect on normal use.