Yes, if the phone is turned on and in service, you can use T-Mobile FamilyWhere® to find it. Keep in mind that if your lost or stolen phone does not have GPS or if it does have GPS, but is not in clear view of the sky, your location may be reported as a wide area.
Can you track a phone through your provider?
Use your carrier's mobile tracking service. Providers such as AT&T, Verizon and Sprint offer a tracking service that allows you to locate a missing phone via GPS. Typically this only works if you initiated the service before you lost the phone.
Can I track a cell phone with just a number for free?
Truecaller Truecaller is the world's best tracking app for locating mobile numbers. You can use this free app to track any unknown number. Features: It is available for iPhone and Android users.
Locate a family member's device After you share your location with members of your Family Sharing group, they can help locate a missing device that you added to the Find My app. See Locate a device in Find My on iPhone. ... You can also use Find My iPhone on iCloud.com to locate a family member's missing device.