1. Yes. If there is a program called cydia on the desktop, if it is, it means it is jailbroken. If it is not, it means it is not jailbroken. (Of course, you can also look at the second method);

2. Download a pp assistant, 91 assistant or itools software on the computer, connect it to the mobile phone, open the software, and the phone will appear with a jailbroken icon or a jailbroken one. The text means it has been jailbroken (as shown in the picture). If there is no icon or no text, it means it is not jailbroken.