You can redeem a Skype Gift Card by adding its value to your Skype account as Skype Credit, which can be used for calls, SMS, and subscriptions.

Method 1: Redeem via Skype Website (Recommended)

1. Go to Skype’s Redemption Page. 
2. Log in to your Microsoft/Skype account.
3. Enter your Skype Gift Card code in the redemption box.
4. Click "Redeem", and the amount will be added to your Skype Credit balance.
5. You can now use your credit for international calls, SMS, or subscriptions.

Method 2: Redeem via Microsoft Account

1. Go to redeem.microsoft.com. 
2. Log in with your Microsoft account (linked to Skype).
3. Enter your Skype Gift Card code and click "Next".
4. The balance will be added to your Microsoft account and can be used for Skype services.

How to Check Your Skype Credit Balance

• Sign in to your Skype account at Skype.com. 
• Go to "My Account" → "Billing & Payments".
• Your current balance will be displayed.

Important Notes:

• Skype Gift Cards do not expire once redeemed.
• Skype Credit cannot be used for premium subscriptions like Skype Number or third-party services.