Is there an app that interrupts Wi-Fi signal?

I'm a college student, sharing a room with my sister that plays video games as night and doesn't understand I want to sleep early and I'm a light sleeper so the tv sound, her voice, and the light doesn't let me sleep. We've been on back and forth arguments for months now and I got tired of it so I stopped arguing only because it was affecting my overall mood.

Is there an iPhone app or something that interferes with our Wi-Fi signal or what can I do to bring it down without disconnecting it? I don't want to go and disconnect the cables because that will just start a war.

Will metro pcs flash my iphone?

I have a bad esn iphone 4s and was wondering if you know whether or not
metro pcs does these?
Will i be able to get talk text and data? Fully functional?

How to log out of twitter on my iPhone?

My friend was using my phone and she logged in her twitter account. Now I can't log out and I'm signed into both of our accounts and I keep getting her notifications. How do I take hers off?

Can my iPhone have a delayed response because I blocked someone's number?

Blocked my ex's number about a week ago and ever since, my phone has been slow but only at certain times of the day. I could be in the middle of a call or email and the screen will act like its getting a call but no name/ number appears. I'm thinking maybe he's trying to get on contact with me and that's why it acts up. Has this happened to anyone else?

How to toggle/turn off 3g on iphone 5 with LTE?

I updated my software to iOS 6.1. Then I notice in the settings>general>cellular the toggle to turn off 3g was replaced by enable LTE. Our country offers free LTE up to April 2013. How will I turn it off (3g) if for example i would want to use wi-fi instead?

I wish to sell my iphone 5, should i worry about data recovery after i format it?

I want to get a S3 and wish to sell my phone, should i worry about messages, contacts, email and notes information being recovered? I'm going to format it using the settings within the phone itself.
i used this phone a lot in bank information and my job's email. Don't want any information obtained. Should i just format and sell it? Or better just keep the phone or destroy it?

I cracked the back of my iPhone?

2 weeks ago I cracked the whole back screen of my iPhone 4 and it works perfectly fine, but when I take my case off and it turns off, when I put it back on it starts to work again and I'm really confused. Why is this happening to me and not my friends who's also cracked the back screen?