Why do my apps disappear when I install them from the pc?

I'm trying to download apps grime my pc like grand theft auto 3 and other stuff like that! It will install on my iPhone but when it finishes it dissappears but it says its still on my iPhone in General>Usage. I don't understand! Any help? I have an iPhone 4 at 6.0.1.

IPhone 4S iOS 6.1.1 won't stay connected to Wi-Fi?

The past two days it hasn't showed any Wi-Fi for me to connect to, (I can turn my phone off and it will connect me for about 5 minutes then go off and then not show any networks) I thought It was my router but I got to my moms and i'm still having the same problem! Any suggestions? I've shut my phone down, reset my network settings. It's very frustrating because i live in a no service area and the only way my phone will work is connected to Wi-Fi.

My iPhone memory is very low and I need some ideas on where to put my pictures

I'm on a long trip and will not return home for another week, but y iPhone memory is too low to take more pictures! I thought about uploading all of my photos to Flickr and then deleting them from my phone to gain more memory to take more photos of my trip. Has anyone used Flickr before? Will my pictures have too low of a resolution from being uploaded straight from my phone when viewing it on a computer? Please let me know if you have any other suggestions on where to upload my photos to gain more memory!

Should i switch from Windows to Mac?

I'm thinking of buying a Macbook, it's expensive, but at-least I enjoy the liberty of knowing I won't be catching any viruses. I heard it's faster and more stable, and can connect fluently with other apple products (have an iPhone 5).

What i want to know is, what are the downsides?

Is this a crime (against the law)?

So basically i bought an iphone 5 off my 'friend' for £350, she said the phone was unlocked, when actually it was locked to 02. I need the phone to be on orange as i have a sim on contract for 2 years. She basically sold me phone with false essential information. - what do i do?

Added (1). NOWHERE unlocks iphone 5's. One person said he would do it. For £130!

How to delete apps on the iPhone 4s?

How do i delete apps from my iphone 4s. I have 10gb of games that i find boring now but i can't delete them, i've tried holding down the app till it shakes but no red cross appears, no delete prompt in Usage to delete the app either.

Added (1). NO red cross appears.

Where can I get cute iPhone4s cases?

I have looked at websites but am having a hard time finding one i can trust will provide good quality. I have seen the iPhone cases with the pearls, bows, and lace. I would really like one like that. I also like any other cute ones and would appreciate any ideas. Remember it is an iPhone 4s.