Is it possible to have 2 associated Apple ID or iCloud account on a single device?

Okay so I bought a used or second hand iPhone 5 online. The iCloud account is cleared so I input mine. I decided to perform a hard reset or a restore via iTunes but I fear something might go wrong.

So I'm asking, is it possible to have 2 associated Apple ID or iCloud account on a single device (I mean, does the iCloud account or Apple ID of the previous owner of the device is really gone)? Does my iPhone now recognizes my own iCloud account or Apple ID?

How to get a free Iphone 4 or 5 or 5c or 5s?

I really want one. Like win one or something? What sites do this and how can I do it without paying for something? Mines messed up so I was wondering if I could do this in anyway possible.

How to unlock&jailbreak iphone 4 IOS 7?

I've been wanting to know how on a acer chromebook or without a computer because I don't have a macbook yet and I Really wanna jailbreak my phone and unlock it so I can put it on another carrier please help? I have no clue how

Is the iphone 4s worth getting?

Tomorrow my family is ether going with an at&t plan or going to consumer cellular and if we go with consumer cellular i'm getting the iphone 4s and someone said because of stuff apple has added its become slow and not worth having. Opinions?

My iphone won't let me download apps?

I have a iPhone 4 and yesterday it started and it wouldn't let me download ANY new apps. So I reset my phone and it deleted all of my apps so I tried to get them back and it still will not download. Please help I've tried even resetting my Wi-Fi to see if that helps and it still wouldn't. Please please please help. My iMessage isn't even working…

How to import my iphone pictures to my pc?

I've tried plugging my charging to my computer several times to see if the "import picture" option will pop up like it used to, even looked for it on my computer but still won't show that my phone is connected.

Should I buy the iphone 5s or wait for the iphone 6? - 2

I currently have and iphone 4, and it only has 8GB on it, so I can barely hold anything on it, and so, I'd like to buy a new iphone. At first I was planning to get an iphone 5s, it being the best and newest iphone, until I heard the iphone 6 is coming out soon. It promises a bigger screen, thinner phone, and a nicer display, as well as the A8 battery, which will likely be more efficient.
However, the problems I have waiting for the 6 is that
1. I have really small hands, so I already have to hold my iphone 4 with two hands, the iphone 6 will probably be even worse
2. I would prefer to buy my phone now, and not have to wait
3. It will likely be very expensive when it comes out, and I'm only 15, I don't have that much money, and my parents will not buy it for me.

However, I still wonder if the better graphics and battery will be worth it.

What do you think I should do? (Note: I'm interested in getting an iphone only. No other brands, please.)

Is my Wi-Fi router bad or is it my laptop?

I've had my laptop: Asus G750JW, for about two weeks now and it keeps dropping the wi-fi connection. My router is a linksys WRT54G2 and yes the firmware is out of date and downloading a dd-wrt seems like a hassle. The main computer that is using the router doesn't drop connection (hard wire), nor does any of my devices: iphone/ipad. I recently went to my friends house to test his Wi-Fi to see if it's my laptop or router. Everything was working fine for about two hours, then I got off and came back 30 minutes later and saw that the connection was limited. I've uninstalled and reinstalled the network adapter on the laptop, but that doesn't solve the issue. So i'm curious if it's my router or if it's my laptop.

Added (1). Also, if I were to connect via Ethernet cable, would any of this matter?