Can an iPhone 5 be blocked if factory restored?

I recently found an iPhone 5 which had no passcode protecting it. After asking around the bar if anyone had lost a phone and leaving my number with the barman I did what anyone would do in this situation and decided to keep it. I have now removed the sim and factory reset the device and am looking to sell it to a friend but don't want to sell it to them if it's just gonna get blocked. I guess the question is - Is there any way the owner can block the device even though the sim has been removed and factory reset? I live in the uk and the phone is on Vodafone btw

Is unlocking an iPhone by jailbreak illegal?

So I've been reading about this whole deal on the new law against unlocking your smartphone yet jailbreaking isn't illegal. So what if I unlock my phone through jailbreak? Is that necessarily illegal?

Buying apps on the iPhone 4?

Basically I put £10 of credit on my pay as you go iPhone 4 only to find out when I went to buy an app it goes directly through my iTunes. Is there a way to purchase apps using the credit on my phone? Or is there a way to put the credit on my phone on my iTunes account?

Simpsons tapped out game

So I play the Simpsons tapped out on my iPhone but I'm stuck I have two tasks to do but it won't let me do them first is for Smithers to exercise for mr burns but If I try make him do it the action is locked and it's the same for comic book guy going on a date with skinners mum the actions are locked so how do I make them do it any ideas?

Am I spoilt for a 14yr old boy?

I'm 14 and i have an iPad, Laptop, iPhone, iPod, Xbox, TV and ps2, I'm given £20 pocket money every 3 days and they always take me to places by car rather than making me walk, they also buy everything that i ask for and take me to mcdonalds 3 times a week. I want to know if i get spoilt by my parents or not

GOING ABROAD WITH AN IPHONE4S?

I have a iphone 4s i'm going abroad tonight.
I like using apps such as instagram facebook and snapchat. Do i have to keep mobile data turned off when i have a Wi-Fi or on please tell me what to do?

IPhone randomly shuts off and shows weird scripts?

I have a problem with my iPhone 4S, it just tonight shut off randomly about 2 times. Each time it took about 15 minutes to restart. What It does, it does like as if the screen were broken, it does a flash and the next thing you see is the apple symbol. Most of the time It won't let me turn it off and back on. But if it does, it shows sometimes blue. Red. Or even green letters an they just run off the screen, and then there's writing on the top, like if you were starting a pc and it has the black screen with all the writing. Sorry it's late at night and I can't think of the word for it. But yeah, it does that while the apple symbol is still in the center of the screen. It's late at night. Hope this makes some sense