Xbox live and adding a code

Trial codes do not stack and like the previous reply said you would have to wait till your current subscription ends. Then add it in.

Another thing is that you would not be eligible for the free games with gold with the trial subscriptions.

You can't use them until after the 1 month has gone away. I can't remember if the 14 days codes stack though

Worst come to worst you just wait to day 14 until you enter the next code

The 14 day codes are trials and trials do not stack. So yeah, if you do use them you have to wait for each one to end before adding the next.

Sign in to Xbox LIVE with the account for which you want to use the prepaid code.

Press the Guide button on the controller.

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Go to Games & Apps and select Redeem Code.

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Enter the 25-character prepaid code and select Done.

When prompted, click Yes to confirm the redemption.

Here is what happens to your account when you redeem different types of prepaid codes:

Xbox 360 Entertainment For All Plan: You cannot “stack” or combine prepaid subscriptions during the life of the contract.

Xbox LIVE Gold Membership: An Xbox LIVE Gold Membership is added to your account, or an existing membership is extended.

Microsoft Points: Microsoft Points are added to your account.

Xbox LIVE Marketplace content: The content is added to your account and begins downloading.

If you bought Live through Xbox, it is automatically added to your account. You don't receive a code.