Large crowds can help you identify the person tailing you so that you can give the description to the police. If you call the police and a local undercover is following you, it will usually back off. If it is a state or federal officer tailing you, then they will likely get pulled over by the local police. If it is a private investigator, they may get ticketed and you may be informed as to what was happening.
You can easily revert a jailbreak by restoring your iPhone. This will remove all apps that rely on the phone being jailbroken, which means all spy programs will be disabled. See this guide for detailed instructions on restoring your iPhone.
If you are using Windows, press Ctrl+⇧ Shift+Esc to open the Task Manager. Look in the Process or Background Processes section, and make note of any unfamiliar processes. Google anything that is unfamiliar to see if there are keylogging programs installed. If you are using a Mac, open the Activity Monitor. You can find this program in the Utilities subfolder of your Applications folder. Look through all of the active processes and note any that are unfamiliar. Use Google to find out if they are malicious or not. Keylogger processes often take up a lot of resources as they have to track a significant amount of information.
There are some ways to know if someone is remotely accessing your computer. You may see something in the bottom right or left corner that says that someone is controlling the machine remotely. There may be a drastic change in the desktop. There may be a blue or black screen, or the desktop icons may become awry. You may see erroneous clicks and things happening on the screen. [10] X Research source
