App store stuck on loading screen iPhone 3G

same thing happening here... good wifi and network signals....

Same problem here.  Doesn't matter if I use wifi or 3G. 

I just had the same issue on my 4S. Hold home button and sleep/wake button till it shows the slide to power down thing. That fixed it for me. Powering down with just holding sleep/wake didn't work, nor did quitting the app. Hope that helps :)

I have an iphone4 and tried this I don't know if this would work for you but I tried it for Me and it worked

For jailbroken iPhones:

If you have a jailbroken iPhone, go to Cydia and search and install Mobile Substrate

Then after it is installed go out of Cydia and swipe the top bar (the one that has battery, time and date)

Left to right. A menu will appear with icons, find the power icon in the menu and press it,

then press Safemode. Your iPhone will reboot in safemode. After it rebooted in safemode

Open AppStore and search for the app you want then install it (you have to wait for it to install). after installing it, exit AppStore And swipe the top bar again, another menu will appear press restart and then in the menu and then

Wait for it to restart. After it's done, open your app and play.