Can you locate an iPhone if location is turned off?

I have an iPhone 4S and the main person on my account put it where they can go on the Internet and see my messages and locate my phone. Can they see if I text from an app and can they find my phone if location is turned off. I need to know all I can about this.

No, your phone will not be tracked if it is turned off. By the way, I suggest you set up Find My iPhone in iCloud on the device and apply a free anti-theft apps like iLostFinder on the phone to protect it later. I have lost my phone recently. It is better for you to take some measures to avoid loss.

http://ikeymonitor.com/free-apps