To use a promo code on Verizon Fios:
Visit the Verizon Fios website or log into your account.
Choose your desired plan or service.
During checkout, look for the "Promo Code" or "Coupon Code" field.
Enter the promo code accurately.
Click "Apply" or "Submit" to validate the code.
Confirm the discounted price before completing your order.
If you have any issues, contact Verizon Fios customer support. Enjoy the savings!