My iphone 4 doesn't let me to install apps?

My iphone 4 is on 6.1.3 and its jailbroken with redsnow. I have 3 GB memory left and my iphone downloads the app but it won't install it. I can't even install the apps using itunes and itunes doesn't even backup my iphone. Please Help

Added (1). Yeah I have appcake and vshare as well and they both giving me error for installing.

Iphone memory and usage

So I have a 16 GB iphone 5, and 0 bytes left. 3, 187 pictures, a fee folders of apps i use, and 108 songs. Lots of iMessages. Do the iMessages take up usage (NOT CELLULAR DATA) but as in memory on my phone?

How to prove iphone 3gs works without a sim card?

A friend bought an iphone from somebody but decided not use it so he gave it to me and I want to sell it. The problem here is it seems to have Wi-Fi connected but there's nothing else. I don't have a home button or anything nor browser. When I tried to activate it just so that I can prove it works there's no activation. How can I sell this phone to someone w/o a sim card? So if the phone isn't activated does it mean it was jailbreak or something and considered as trashed? I don't use iphone at all so I have no idea.

What exactly does the iPhone backup back up?

I'm going to update my iPhone software (finally!) and I'm worried that all of my data won't be saved. For example, will I have all of my notes, picture folders, app data, emails, etc? I'm terrified that I'll lose my notes. I can email them to myself if need be and there's really no way to back it up, but I'd like to aboid that tedious process if possible.

Can I trade in my Galaxy S3 for an iPhone 4S?

My dad got me a Galaxy S3 (Men NEVER pick out something for a woman. Let her pick it out, trust me) and I don't have the heart to tell my dad that I wanted an iPhone because it's my graduation present. I haven't even received it yet, it's sitting in a box brand new at his house. Would it be possible for me to go to an AT&T and swap phones? I have unlimited texting, unlimited calling, and 300 MG data plan - so could this rollover to an iPhone? Would it cost more?

Can I Get a New Screen From Apple If I Changed it to Red? (Warranty)?

I Have a red broken iphone 4s screen and i'm wondering if i can get a new one. I have warranty for it but since i changed it to red (used to be white) will apple give me a new screen? Also, my speaker doesn't work and can Apple only change the speaker and not the glass with the warranty?

Help looking for an app on my iphone?

I had it a long time ago so all i remember is that it was a game where you were colorful gear things that stuck to whatever wall they touched. It had a story line and you had to rescue your "gear" friends. I also remember you could click on the gear that you wanted to be and get it to saftey by tilting the phone. It was animated and very colorful, i need to remember this please help

Keep Sharpie autograph on iPhone?

I recently met my absolute idol Ariana Grande. She signed the back of my iPhone 5 in Sharpie. What can I do so that it doesn't rub off when I use it or when it rains?