Hi, My name is Jenny and I work with the Embarq customer outreach team. You are not able to use your Embarq phone with Sprint service. Embarq may use Sprint towers to deliver you signal to your phone, however the phone is programmed to work with Embarq only. I hope this helps you to understand why you can not use your current phone with another carrier. If you have any other questions feel free to email me at Embarq_Jenny @ Embarq.com anytime.
Thanks
Jenny R.
Embarq customer outreach team
Embarq_Jenny @ Embarq.com