How to delete an iCloud account if I don't have the password?

So I bought an iPod touch from someone last month, and they left their iCloud account on it. I just noticed this and someone told me that they can see all the pictures I take and stuff! When I clicked "delete account" It told me to turn off "find my iphone" and it asks me to put in the apple ID password, which I don't have because it's someone else's.

Is it worth it to upgrade from an iPhone 4S to a 5C?

I currently have a 16GB iPhone 4S. Due to storage space issues, I want to upgrade to a 32GB or 64GB model. I'm considering getting the 32GB iPhone 5C, since it's cheaper than a 5S with the same capacity.

Is this a good idea? Will a "budget"-level model like the 5C be at least on-par with the 4S, performance-wise? Or would it be smarter to get the more expensive 5S? I just don't know if it would be worth it to spend $100 more when my main priority is just storage space.

What do you think?

Skype call for my Iphone 4 isn't working properly?

Whenever i call (voice call) or receive a call, we can talk for like 20-30 seconds then can hear nothing for 10 seconds then the call fails/drops…
It has only been like this for like 2 days, it wasn't like this before.
I don't know what's happening? How can i get it to work?

Is this too many devices connected to my router?

So I have AT&T as an internet provider and lately I have been having connecting problems with my router, because my IPhone 5c and Xbox 360 keeps disconnecting. We just had the tech guy set up a new router, but didn't make a difference, so I think its something to do with the amount of stuff connected to my router. Here's a list of stuff connected:

1x HP Pavilion Laptop
1x Sony PS Vita
2x IPhone 5c
1x PS3
1x Xbox 360
1x Verizon Ellipsis 7
1x Dell Notebook
1x Dell Desktop
1x IBM Laptop
1x HP Laptop
2x Nook HD Smokes
2x Kindle Fires
1x Nintendo Wii
1x Roku
Occasionally a Nintendo 3DS too

So that's all the stuff connected to the router, so can anyone tell me if this is the reason I'm having connection issues?

Best deal for iPhone trade-in?

I was looking to sell my iPhone 4S for the best deal so that it can go towards my new iPhone upgrade.

From the looks of it, Best Buy has shown me the best offer of $95 for my iPhone 4S, 16gb Verizon. I'm really trying to avoid websites such as eBay because I don't want to risk a scam. Gazelle offers too low of a price. If any ideas, please let me know!

How to install older version of Facebook Messenger in iPhone?

Okay my question is really very simple, How do I install the older and better version of facebook messenger and its mobile app in my iPhone 4? I don't have a backup copy but I do have one that I have downloaded from internet. I'm really sick of this new app for what I have to jump back and forth for every little thing I type. And by the internet browsing I don't think I'm the only one to feel agitated. Help please!

Added (1). Oh and BTW the version I want to install and have at the moment is FB Messenger 3.4xx.ipa.

What is causing my iPhone bill?

Hi, i'm getting pretty big iphone bills at the end of each month, and i don't know why. I've turned data roaming off, and my contract says i have unlimited calls, texts and data usage. Any suggestions as to what it is thats causing these charges?