How to lock individual app in iphone 4s?

I want to lock whatsapp in my iphone 4s, but i can't get any app to lock, there are only photo and video lock availble but no app lock, why is that, i can't jailbreak! Please help me with this solution in locking the apps in iphone free app?

Buying an iPhone 6 Plus online?

Buying an iPhone 6 Plus online?

Added (1). have anyone tried this site?
http://appleoff.wix.com/appleoff#!price-list/czfo
it offers cheap apple products, but can I trust it?
how do I make sure it's not gonna rip me off?

please if anyone knows anything that can help me, answer as soon as possible

Ebay: Buyer wants to return Apple ID Locked iPhone?

I sold an Apple ID Locked iPhone 4 on eBay. After the buyer gets it in the mail, he sends me a message saying

'Hi, so I got the item but its telling me that the owner has to remove the item from find my iphone cause its not letting me get into the phone by using my apple ID. So please can you remove it from your device?'

I write him back telling him that this is an Apple ID LOCKED iPhone. I specifically wrote that in the title of my ad. Further, I even put in the description 'This iPhone is Apple ID Locked. I do NOT know the User ID & Password to access this phone'.

He then writes me back saying:

'Hi, So since I can't use the device. I have to return it because I took it to the company and they could not fix it either.'

What do I say to him? I already mentioned clearly that this iPhone is Apple ID Locked. I'm not a business either so I'm not about to let this buyer get his way. I advertised everything perfectly. I even sold the phone for an EXTREMELY LOW PRICE. It sold for $40 with $2.99/shipping.

Should I write him back saying I'm sorry but I can't do that. This phone is Apple ID locked and that's what was advertised.

Big cowlick and/or crown, or am I thinning?

I've paid attention to this for a few months now, it hasn't changed. This is a recent picture. No hair falling out and the hair isn't thin or whatever. But I'm concerned about how big this crown or cowlick is.
Also, you can't see it in this pic but to the right of the crown, there's scalp cleavage too - similar to the ones that are already shown.
In this specific picture, my hair is quite damp. Straight outta the shower and a quick towel dry. I also combed the hair so I can really identify what I'm dealing with.
This photo was taken on an iPhone. On a handheld mirror it doesn't look all that bad but when I observe it on my phone it definitely appears worse.
My hairstylist says it's the crown and direction in which the hair grows.
I'm 18 and an asian male. I've read that the hair of asian males tends to have prominent crowns and cowlicks due to its thickness and stubbornness along with lack of density.
Please help. I'd kill myself if I were bald.Big cowlick and or crown, or am I thinning

I have a Iphone 4 and I have Aux Issues?

When i connect a Aux cable to my Iphone 4 it will not work, I tried it in the car and in a stereo. The music be on, then i connect the cable & the sound goes silent. I can see it's still playing on my Iphone, but there's no Sound