- Visit Optimum.com/mobile/shop/phones
- Choose your new device
- Select Payment Option
- Tap Add to Cart
- Tap Yes, login to my account
- Enter your login and password details
- If your Optimum Internet account isn't linked to your Mobile account, we will ask you to do it. You can Skip or enter your Optimum Internet account number and tap Submit
- Tap Upgrade a line
- Pick the line you want to upgrade
- Tap Upgrade
- Tap Continue
- Tap Proceed to checkout
- Confirm your shipping address and tap Continue
- Enter your SSN, Date of birth and tap Save and continue
- Tap Apply changes
- Tap Save and Continue
- Answer the Security questions
- Select Payment method
- Select the checkboxes and tap Agree and continue
- Tap Continue
- Tap Place order