Q: delete documents and data on my iphone 4s

Hello there, varun844.

It sounds like you're wanting to manage and delete Documents and Data on your iOS device. The following Knowledge Base article offers up some great information in that regard:

Manage your iCloud storage

Backups

When you back up your iOS device to iCloud, the most important data on your device is backed up automatically, including your documents, photos, and videos. Learn more about what iCloud backs up.

Use the steps below to manage how much storage you use.

Select which iOS apps to back up

Many apps automatically back up to iCloud after you install them. You can change which apps back up to iCloud and remove existing backups of that app's data from your storage.

Use these steps on your iPhone, iPad, or iPod touch:

1. Tap Settings > iCloud. 
    
   • If you're using iOS 8 or later, tap Storage > Manage Storage.
    
   • If you're using an earlier version of iOS, tap Storage & Backup > Manage Storage.
2. Tap the name of your iOS device.
3. Under Backup Options, turn off any apps that you don't want to back up. When you're asked to confirm, choose Turn Off & Delete to turn off Backup for that app and remove all of its data from iCloud.

Delete backups and turn off Backup for your device

Use the steps below for your device. 

iOS

1. Tap Settings > iCloud. 
    
   • If you're using iOS 8 or later, tap Storage > Manage Storage.
    
   • If you're using an earlier version of iOS, tap Storage & Backup, then tap Manage Storage.
2. Tap the name of your iOS device.
3. Tap Delete Backup. When you're asked to confirm, choose Turn Off & Delete to turn off Backup and remove all backups for that iOS device from iCloud. When you delete a backup, it also turns off backup of your iOS device.

OS X

1. Go to Apple menu > System Preferences, then click iCloud.
2. Click Manage and select Backups.
3. Select one of the device backups, then click Delete. When you're asked to confirm, choose Delete if you want to turn off Backup and remove all backups for that device from iCloud. When you delete a backup, it also turns off backup of your device.

Windows 8 and Windows 7

1. Open iCloud for Windows.
2. Click Storage.
3. Select Backup from the items listed.
4. Select one of the device backups, then click Delete. When you're asked to confirm, choose Delete if you want to turn off Backup and remove all backups for that device from iCloud. When you delete a backup, it also turns off backup of your device.

Thanks for reaching out to Apple Support Communities.

Kind regards.