Chances are that someone else could have tampered with your iPhone or even jailbroken it without letting you know. Jailbreaking: Most of the spy apps only run on jailbroken devices.

Higher data usage: Since the spy app would continuously upload the device details to its servers, you will notice a sudden spike in the data usage.

These are some of the common side-effects of a spying app that helps us detect its presence on our phone. It's worth checking the drafts and trash folders in your accounts too for any evidence of unrecognized activity.If you think that someone has installed a spyware on your iPhone, then consider the following suggestions. We'd also recommend looking through the activity on your accounts-activity such as the sent folder in your email account, for example, or the messages that have been received and sent on Twitter or Facebook Messenger. To remove a device, tap the three dots to the side of any of the entries, then Log out. This isn't the case for every app though-on Instagram, for example, if you open up the app settings then tap Security and Login activity, you can see a list of all the devices linked to your account. Some mobile apps, like WhatsApp and Snapchat, can only be used on one device, so you know that the login you're using is the only active one. In the case of Gmail on the web, click the Details button in the lower right-hand corner to see other active sessions. For Facebook, for example, open your settings page in a browser and click Security and login to see all the devices where your account is active (and to log out of ones you don't recognize). If there's an unwanted visitor in your accounts, you should be able to find evidence of it. Facebook will list all of the devices that you've logged in on.

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