Can you use an iPhone without a data plan?

I've heard you can use the iPhone without a data plan by turning off the data on the phone before putting your SIM card in. My friend has been doing this for a while with a hand-me-down iPhone 3 he has. Does this also work with an iPhone 4? Another friend has given me her old iPhone 4 that I would like to use but I do not want to pay for a data plan when I could just use Wi-Fi. My carrier is AT&T and the phone is an AT&T phone as well.

Wi-Fi not working on iPhone 4?

My iPhone 4 won't connect to Wi-Fi unless I'm in the same room as the Wi-Fi box. As soon as I leave the room that the box is in it disconnects. & won't reconnect until I go back to that room. My iPod and laptop & my sisters iphone 3 will connect anywhere in the house. I have called apple and they want me to pay 300$ for a warranty before they'll help me! 10 points to best answer

Apple app store wants too much info

I have an iPhone 4s where every time that I open the app store it wants my payment info. I want to just download my updates! It says that "there was a problem with a previous purchase" and it won't let me leave and download anything. I'm afraid that if I give it my info that it will charge me for something and I don't want that. I have no idea what is wrong and I don't want to be charged for something I don't even know I had.

How to make sure apps are closed on iPhone5?

I just got an iPhone and it is the first time I have had a smart phone and an iPhone. I'm paranoid about going over my data.So, I was wondering, how do I make sure that my apps are closed? Is pressing the home button good enough? I know some are going to use data even when closed but I just want to make sure that when I close something it is closed.

Sprint iPhone 5 free hotspot?

I have an iPhone 5 on sprint. Recently personal hotspot showed up in my settings menu and it actually lets me use it even though i don't have it in my plan. I wanted to know if this happened to any one else and if its safe to use it without getting billed for it.

Ice cream sandwich iphone 4 case from etsy?

I'm in the market for a new iphone 4 case and i have been looking on etsy for sometime.
i found this one which is really cute: http://www.etsy.com/listing/114288689/sale-iphone-4-case-iphone-4s-case-ice?ga_search_query=ice

but there are no reviews on it on etsy, and i've seen some on amazon that are roughly similar and have really bad reviews. I Really like the ice cream sandwich case.
anyone have any thoughts/experience/recommendations?

How to downgrade an iPhone to iOS 5 on a PC?

I just started using my brother's old iphone 4 as an ipod touch (I already have a phone and was previously using a 3rd gen ipod touch), and I want to reverse my mistake of downloading ios6. I'd rather keep using this iphone than go back to my old ipod which still has ios5 because of the crisper screen and the camera. The only cool features of ios6 that work on an iphone 4, such as turn by turn navigation, don't apply to me because I can only connect to the internet with Wi-Fi, so don't tell me it's worth the setbacks to keep the new OS.

My main problem with ios6 is how it affects youtube. I already used google's youtube app before I downloaded ios6, and I liked the improvements it made to the old default app. Now, the youtube app automatically adjusts the quality of the video based on your internet connection in ios6. This means half the time the video loads at extremely low quality, both audio and visual, yet before I downloaded the new ios it was always high quality. This is a deal breaker for me because I'm only using this device for music and videos.

I looked up how to download ios5 already, and kept getting directed to this link http://www.maclife.com/article/howtos/how_downgrade_back_ios_5. This doesn't help me because I have a pc, and the instructions are for a mac. When I got to step 3, I couldn't figure out how to get to the "Finder File", because there's no option key on pc keyboards. I tried the alt and ctrl keys with no luck.

So how can I downgrade to ios5 using a pc? I already have the ios5 file from the above link, I just need to get it onto the iphone.