How to reset iPhone without passwords?

I just bought an iPhone 4 off of someone and want to reset the phone so I can use my iTunes and iCloud account but I can't reset it without their password, but no longer have contact with the person to get the password. Is there anyway to do this?

IPhone 5 or iPhone 5s in a year and a half or two?

I've currently got £290 and If i currently sell my phone for around £90 I can get the iPhone 5 or 5c but would prefer the 5. But, I would LOVE to get the 5s but my parents don't want to pay for it and they want me to work for it and earn the money if I really want it but by the time I get a saturday job is next year in June because I'm only 15 at the moment so it'll only be around December next year that I get the 5s. So what should I do, wait till next year/about a year and a bit or buy the iPhone 5 which I think is a great phone still?

Which phone i should buy? Iphone 6 or xperia z3?

Which phone i should buy? Iphone 6 or xperia z3?

Added (1). well i like both i used to have an iphone and i used to have android well theirs cool things about android too and well i saw their features and the xperia is better but the iphone 6 is popular and i'm hesitating in which one to buy i have the money to buy it as soon as possible but i don't know which one you will recommend me?

Should I buy my daughter an iPhone 5?

I can afford the phone, BUT my daughter is very clumsy and irresponsible. She has good grades and all, and has been bugging me for months for the darn phone.

I honestly don't know what to do, she's eleven, I add.

So tell me, should I get my daughter an iPhone 5?

Added (1). Okay guys, I decided I'm getting her an iPhone 5 ;D