How to tell if an iPhone 5 is CDMA or GSM (without SIM)?

Say I'm looking to buy a used iPhone 5.
How can I tell if it is CDMA or GSM?
Is there a way to check the settings or something? I don't have SIMs for different networks either, since it only takes nano SIM.
I don't want to have to go to the store and have them swap to a nano sim just to check it and then swap back if it doesn't work.
There must be an easier way?

Background light on my iphone won't work

I'm not sure if its called the background light, its like the light for when you turn on your phone all of that.okay so i dropped it a little and then i tried to turn it on and it won't work but the sound works like i've gotten texts and calls and i can hear them just the light won't go on

IPhone text message problem?

I can text my friend and it comes up in blue and he has an iphone but my other friend has an iPhone but it comes up in green

What's the best tablet out there right now?

I'm thinking of getting a nexus 7, but I also saw the ipad mini and now I'm not sure. I already have two iPhones and heard the ipad mini is the same as all other apple products.

Do I need to buy a contract when buying an iPhone?

My iPhone was stolen from me and I'm trying my best to hide it from my dad lol. I already have a contract on my dads account, so when I purchase a new one will I need to buy another contract or can I just buy the phone?

IPhone 5, Samsung Galaxy Note II, or other Android phone?

I'm getting a new phone soon and am torn between the iPhone 5 and the Samsung Galaxy Note II… My current phone is an iPhone 3GS but with the market increasingly driven by Android phones and the more open-sourced nature of the Android Market (never mind the fact that the Note has some pretty awesome features) is making me question which one to get. I like the features of both and was originally leaning towards the new iPhone, but I've heard some unflattering things about this latest model (besides the Maps debacle) and how it wasn't really an improvement on the 4… Any thoughts?

Will iPhone 5 replacement parts prices go down?

Completely ruined my iPhone 5 and it's a ridiculous amount of money to get it fixed. One guy said he won't even do the job because the prices are too high. How long do you think I will need to wait until the price is reasonable?

Can an Iphone 4 be used on any carrier?

I originally had an iphone 4 registered with AT&T but now I have verizon and just an unregestiered iphone 4. Can I hook it up with verizon and get all my information transferred from my current phone to my iphone 4?