How can I open my iPhone activation lock without owner's account

Hello Aldase,

Congratulations on your new iPhone! It sounds like your new iPhone has Activation Lock setup by the previous owner. I am sure you are eager to start using your new iPhone, but before you can, you will need to contact the previous owner to be able to use your new iPhone:

What if I purchase a device that is still linked to the previous owner's account?

Contact the previous owner as soon as possible and ask them to erase the device and remove it from their account. For complete instructions, read how to remove a device from a previous owner's account.

iCloud: Find My iPhone Activation Lock in iOS 7

http://support.apple.com/kb/HT5818

The previous owner can follow the steps below to remove the iPhone from their account:

If the device has already been erased

If the previous owner is not present
Contact them and ask them to follow these steps to remove the device from their account:

1. Sign in to their iCloud account at www.icloud.com/find.
2. Choose the device from their Find My iPhone device list by clicking All Devices and selecting the correct device.
3. Click "Remove from Account" to remove the device from the account.

After the device has been removed from the previous owner’s account, turn it off by pressing and holding the Sleep/Wake button located on the top right side of the device. Then restart your device and proceed with device setup as you would normally.

If the device has not been erased

If the previous owner is not present
Make sure the device is powered on and connected to a Wi-Fi or cellular network. Then contact the previous owner and ask them to follow these steps:

1. Sign in to their iCloud account at www.icloud.com/find.
2. Select the device from their Find My iPhone device list by clicking All Devices at the top of the screen.
3. Erase the device by clicking the Erase button. This will erase all content and settings from the device. When prompted, do not enter a phone number or message. Click Next until the device is erased.
4. When the erase is complete, click "Remove from Account" to remove the device from the account.

After the device has been erased and removed from the account, you can proceed with the device setup process.

You can find the full article here:

Find My iPhone Activation Lock: Removing a device from a previous owner’s account

http://support.apple.com/kb/TS4515

Thank you for using Apple Support Communities.

Best,

Sheila M.