i forgot my 4 digit passcode to unlock my device. how do i reset?

Hi Kevin is it possible if I would be able to open my old iPhone 4. I don't remember what my 4 digit number is. Thank uou

Follow the links provided by Ckuan

My iPhone 5s I can't remember the four digit pas

Read the thread, the answer is there.

Forgot or Wrong Passcode

http://support.apple.com/kb/HT1212

Forgot Passcode use recovery mode to restore

http://support.apple.com/kb/HT1808

Locked Out, Forgot Lock or Restrictions Passcode, or Need to Restore Your Device: Several Alternative Solutions

A

1. iOS- Forgotten passcode or device disabled after entering wrong passcode

2. iPhone, iPad, iPod touch: Wrong passcode results in red disabled screen

3. Restoring iPod touch after forgotten passcode

4. What to Do If You've Forgotten Your iPhone's Passcode

5. iOS- Understanding passcodes

6. iTunes 10 for Mac- Update and restore software on iPod, iPhone, or iPad

7. iOS - Unable to update or restore

Forgotten Restrictions Passcode Help

iPad,iPod,iPod Touch Recovery Mode

You will need to restore your device as New to remove a Restrictions passcode. Go through the normal process to restore your device, but when you see the options to restore as New or from a backup, be sure to choose New.

You can restore from a backup if you have one from BEFORE you set the restrictions passcode.

Also, see iTunes- Restoring iOS software.