Iphone 4 Read Receipts accuracy?

Okay so I have an iPhone 4 with IMessage and I have read Receipts turned on. But I'd like to know how accurate read receipts are. What does it go based off of? How does it know you really read it? I do it a lot with my boyfriend and there are times hell say "you read that like 20 mins ago" even if I just picked up my phone and saw. How accurate is it?

How to open my music on the iphone 5?

I'm new to apple.used android before. I synced my itunes and iphone. The music is on there. I don't know how to open it without asking Siri to do it for me.

I can't find it on the itunes app thingy. It just opens an itune store

Added (1). Click by click instructions please!

Smashed my iphone and it went crazy?

Ok so i threw my iphone 4s on the ground and it shattered on the front and back but it still turns on, but both cameras won't work and when i try to take a picture its just black, also the sound won't work and whenever i use it the front top right hand corner goes really hot, aswell as the whole steel edge thing and the back top middle if that makes sense. Does anyone know what's going on maybe? Please answer!

Diy iphone color conversion?

I cracked the front and back of my iPhone 4S and i was wondering if anyone had any good/bad experiences with diy color conversions, is it worth doing it yourself or should i just pay the extra and get a proffesional to do it?

Disabled IPhone 3G can't remember the passcode?

I have a old iPhone 3G that I haven't used in over two years.

now it's disabled because i can't remember the passcode and the iPhone wants me to connect to iTunes the thing is i've never backed it up to iTunes.
If I do will I lose anything that is still on the phone and if so is there any way to bypass this without loseing any of the pic's or any thing that may still be on the phone