"But I am wondering if the phone is locked out and they don't have access to it, does it still connect to internet to be tracked?"
Sì, ma non deve essere esclusivamente tramite Wifi. Il dispositivo iOS deve essere solo online. come definisce online per un dispositivo iOS?:
"An iOS device is online if it’s turned on (with or without a passcode lock) and connected to a data network, such as EDGE, 3G, 4G, or Wi-Fi. "
Quindi, se il tuo dispositivo è online, ecco come seguirlo :
Locate your iOS device:
Sign in to icloud.com/#find with your Apple ID (the one you use with iCloud).
If you’re using another iCloud app, click the app’s name at the top of the iCloud.com window, then click Find My iPhone.
Click All Devices, then select the device you want to locate.
In the list, the dot next to the device indicates its status:
A green dot means it’s online.
A gray dot means it’s offline.
If the device is online, its approximate location is shown on the map. The green circle around the device indicates its location (the smaller the circle, the better the accuracy).
Tieni presente che trovare il mio iPhone è un prerequisito, sebbene sia chiaramente abilitato se hai già bloccato il dispositivo.