IPhone 4 was stolen. How do I lock it if I'm nowhere near it so the thief won't be able to use it?

Yes, I know I'm stupid for not engaging a passcode for it. Grr.

Added (1). I know who has the phone. Trying to find some time to confront the man that stole it but I don't want the service provider to switch it off. I want the thief NOT to be able to use it in the meantime. People at the Apple Store I can do that myself (lock it from where I'm) but were unable to tell me how.

Call your phone service supplier and they can switch it off, they can also probably detect where it is.

Hope that helps and best of luck.By the way maybe you lost it and it not hurt to try and call it.

Have the cell phone provider turn disable the sim. They will not help you find the phone without law enforcement, but they can black list it. If it is on ISO 8 and you have iCloud or "find my phone on" it is a brick to them after you turn off the sim.

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