"Contacts, texts, GPS data, apps - not photos or videos, they're too data intensive... but those are stored on the phone, and based on the account data on the SIM card, it feeds back to the account owner. They can read any of the phone data, just within their account. And use the security features for a lost device to track it, even without any GPS apps, which it DOES have. It all goes to the cloud. Unless you reprogram it, that is."