By pressing the lock button on the top right of the iPhone.
You can't lock your iPhone apps without jailbreaking the phone.
Yes. If you update your iPhone's software using iTunes it will lock your iPhone again. You will then need to unlock it again.
Overlock? By trying to put in a fake passcode to a lock screen it is possible to lock yourself out of the iPhone for a pre set time.
Yes you can but it's not as polished as the iPhone's lock or an Android phone's lock screen. And if you meant does this phone have a "lock screen" when you put it to sleep like the iPhone, no it doesn't
There is no way to do that. If you jailbreak your iPhone there is an app on Cydia that does that.
No it shouldn't, unless you have your lock set to come on after a restart.
jailbreak and download androidlockxt
Yes, by plugging the iphone into your computer and updating the software on it using itunes.
If you bought an iPhone 5s from eBay and it is locked with a fingerprint lock, it will not be possible to unlock it if you do not have the Apple account.
you press the black button on the left size of the phone. it has a picture of a lock on it.
Go to settings general passcode lock set code