Putting the device into recovery mode can resolve your problem!
And when attempting to print, they receive the message: “No Air Print Printers Found.” This is, unfortunately, a common error complaint and occurs more frequently than anyone cares to admit.
tel://NUMBER will pop up a dialog asking if you wish to make a cellphone call to NUMBER using the baseband.
facetime://CONTACT will pop up a dialog asking if you wish to make a video call to CONTACT using Apple's Facetime over Wi-Fi.
Changing SIM card, you can be tracked by cellphone used.
Location can be narrowed down using IMEI triangulation of cell towers the cellphone is closest to.