Iphone lost/stolen can they use it?

I lost my iphone 4 days ago and no one has handed it in so someone has probably taken it for themselves. I didn't want to miss out on Christmas messages so I canceled the sim 3 days ago and the carrier (3 UK) told me they were going to block the phone too but that I could ring back and get it unblocked if I found the phone.

Firstly I had my own pin code on the phone so they could not use it when they found it, but then the next day 3 blocked the phone so my question is; can the person who has my phone now do anything with it? If they get it unlocked/jail-broken will it work even though the IMEI is blocked?

And second question; If they can unblock it will they be able to see all my photots?

Where there's a will, there's a way. A pro can easily hack the phone and extract all the data. The IMEI block may help in blocking the use of the phone on a specific network but I'm sure with the right jailbreak it can be used with a different network or within another country.

They can always use it for wi-fi use only and as an iPod touch.

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