i have a iphone 4s with straight talk and my app store wont let me download anything from it what do i do?

Hello there, Tremonteo.

The following Knowledge Base article offers up some great recommendations for troubleshooting your issue:

Can't connect to the iTunes Store

http://support.apple.com/kb/ts1368

Particularly:

Troubleshoot issues on an iPhone, iPad, or iPod touch

If you haven't been able to connect to the iTunes Store:

• Make sure your date, time, and time zone are correct in Settings > General > Date & Time.
  Note: Time Zone may list another city in your time zone.
• Make sure that your iOS software is up to date by tapping Settings > General > Software Update (iOS 5 or later) or connecting your iOS device to iTunes and clickingCheck for Updateon your device's Summary page.
• Check and verify that you're in range of a Wi-Fi router or base station. If you're on a device with cellular service, make sure that cellular data is turned on from Settings > General > Cellular.
  Note: If connected to cellular data, larger items may not download. You may need to connect to Wi-Fi to download apps, videos, and podcasts.
• Make sure that you have an active Internet connection. You can check the user guide for your device for help with connecting to the Internet.
• Make sure that other devices (portable computers, for example) are able to connect to the Wi-Fi network and access the Internet.
• Try resetting (turning off and then on again) your Wi-Fi router.
• If the issue persists, trytroubleshooting your Wi-Fi networks and connections.

Thanks for reaching out to Apple Support Communities.

Cheers,

Pedro.