How to know if the iphone 5 I buy is stolen?

Can someone who is an expert help me because I'm about to buy an iphone 5 from someone face to face so I will get to examine the iphone 5 carefully and can someone please tell me how to identify if the phone is genuine and hasn't been stolen. Can someone also tell me how to identify if the imei number of the iphone is real and hasn't been tampered with because I have heard that people can tamper with the imei number and change it to a number that has a good history so please someone help me identify if the number originally belongs to the iphone that I'm about to buy.

IMessage won't show in messages?

I bought an Iphone5 few weeks after it can't out but never really used Imessenger that much. Now if anyone sends me an imessage if will work for about 5 messages then it won't let me read the others person message the grey box with the message will disappear I have to turn my iPhone off then back on to read the message. Or it will let me read the message in the lock screen then when I unlock the phone and go to read it the message will disappear. I'm using the newest software 6.2 I think.

Any help thanks for reading.

Microphone on my iPhone doesn't work, how do I fix it?

When I'm not on speaker phone, the person on the other line can hear me. But if I put the phone on speaker, it does not work anymore. I noticed when I was taking a video and the sound afterwards, after speaking loudly in the video, was not working. How do I fix this?

Got new iphone and it already has 1.5 gb of other?

So i got a free iphone 4 with my new phone deal and i was just registering it and putting music into it when i noticed that the "other" thing is 1.5 gb. I haven't even downloaded anything onto my phone. Can someone tell me what this "other" thing is and how to get rid of it or atleast lessen the usage. Please help. I only have a little bit storage left because of it. Also if i don't buy the internet and use my own Wi-Fi and get apps and use i message and youtube and search stuff will it cost me money? My cousin told me something about it costing money to use your own Wi-Fi? I think hes lying tho.

Put music onto my Asus laptop?

I have a desktop computer with over 500 songs on iTunes and my asus laptop (which I haven't been on 3 years,) only has a little over 100 songs on iTunes. I need to put all my songs from my computer to my laptop, and the laptop doesn't have a disk holder. And I don't have an iTouch (iphone/ipod) anymore.

Is the Nokia Lumia 920 any good?

I get my phone upgrade soon & I'm thinking of getting the Nokia Lumia 920 or the Iphone 4. As my parents both have Iphone 5's I know what they're like, but have no idea if the Lumia's any good. So if you can… What's it like? Good aps? Good camera? Etc Thank you!