If a 3gcardio.com coupon code isn't working, consider the following steps:
- Check the expiration date of the coupon code.
- Verify the terms and conditions to ensure the code applies to the items in the cart.
- Ensure correct entry of the code without any typos.
- Clear browser cookies and cache to avoid any technical issues.
- Try a different code if available.
- Contact customer support at 1-888-888-7985 or [email protected] for assistance.