Someone is trying to hack my advice

What makes you think someone is trying to hack your device? How do you know?

Also, none jailbroken devices are safe. Just make sure no one except you have physical access to it, you use strong passcode, and you use 2 Factor Authentication with your Apple ID.

Don't jailbreak your iPhone, make sure you have a strong passcode and a very strong password for your Apple ID, don't share these with anyone and if you are getting a security warning on your router make sure you update it.