Hi. I just removed my line on my on plan and changed my number. Now my phone will not work such as making calls.
Did you reactivate the phone?
Try restarting the phone by holding down the top/power button and the Home button at the same time until the phone restarts.
Try dialing *228 from the phone and follow the instructions to activate the phone.
Try logging on to your MyVerizon account from a computer and select "Activate Device".