Yes, there are many apps that can detect if a GPS tracker has been installed on your cell phone.
If you have an Android phone you can download Certo Mobile Security for free from the Play Store and quickly scan your phone for GPS tracking apps and other malware.
For iPhone users, you can get Certo AntiSpy directly from our website and scan your iOS device for a wide range of threats, including GPS tracking apps, spyware, keyloggers and more.