Requirements:
Silver XBL Account.
United States Residency.
Payment Option on account.

Reminders:
This is ABSOLUTELY free.
Follow the following instructions.
Enjoy the free live.

Steps:

1. Sign in to xbox live using the xbox website.
www.xbox.com

2. Click the following link:
HERE

3. Follow the on-screen instructions, until complete.

4. The site will ask if you'd like to turn off "auto-renewal", make sure turn to it OFF. If you fail to do so you will be charged automatically for a renewal membership once your current/new membership expires.

5. If you redeem a membership code during this subscription make sure to turn "auto-renewal" OFF. Redeeming a new code automatically turns "auto-renewal" back on.

6. Repeat the process every month for 1 free month of gold.