Am I able to track my lost T-mobile iPhone 5c?

I believe I lost it at my local grocery store, if someone found it and took it is there anyway I can track it and locate it's position?

Everything problem has a solution… Some of the ways to find your Phone, if not few things you have to do, just go for the link that i pasted in SOURCE…

1. With the power of iCloud it's now possible to locate your device provided it still has access to some sort of data connection (cellular or Wi-Fi). This won't work if your device is not using the Find My Phone service (by default you have to opt out), has run out of battery or was last seen in Airplane Mode, but it's certainly worth a shot.

2. Head over to iCloud.com, login with your Apple ID and the same password you use to authorise app purchases and click on Find My iPhone.

3. Using iCloud.com it's possible to initiate a remote wipe of the phone, which will cause the phone to reset itself to factory settings and preserve your data. Do this by logging in, clicking on Find My iPhone then selecting the device and enabling Lost Mode. Don't forget to leave a message and a phone number in the hope that whoever took it might actually return it (or leave it somewhere, at least).

4. If your phone has been stolen but remains traceable, you may want to hand the information over to the police. There have been a few examples where law enforcement have used Apple's Find My iPhone location data to recover stolen devices, though be prepared that this may not be the case.

5. If your phone has been updated to iOS 7, you've got another safety net in place in the form of Activation Lock. Even after wiping the device, it will require your own personal Apple ID and password to be usable. Until these credentials are provided, the phone will refuse to work as intended. It's useless to the thief, and not even Apple will unlock it.

6. You can tell if your phone has been updated to iOS 7 first and foremost by the graphical style. Apple introduced a new, cleaner interface. You can see the difference at-a-glance in the screenshot above (iOS 7 is on the right). You can also head over to Settings > General > About and look at the number under Version.

Only if you had Find My iPhone installed prior.