Phone Suddenly Deactivated?! Please Help?!

Honestly, it would seem to be on Verizons end. If they cut you off for one of your complicated reasons, nothing you do can change that other than calling them.

 

Do any of your "complicated reasons" have anything actually to do with your Verizon account, e.g. payments. If so they may have terminated or restricted your service. If people call your number, are they getting a number out of service or disconnected indication, or just that the phone might be powered off or out of range. If it's the former, you'll have to call Verizon. If not, could be a fault with the phone in that it's just now gone wrong completely, in addition to the other "major problems", it is three years old.

 

Did you purchase the DROID 3 phone brand new from VZW or an authorized VZW reseller or did you purchase the phone used from someone else? If it was purchased used from someone else, the fault could lie with the person who sold you the phone. Remember, that at VZW, a phone's IMEI is linked to an account and if the person who sold you the phone has an outsanding balance on the account, the phone will be blacklisted. It doesn't matter if you have successfully used the phone for 3+ years yourself. There are documented cases of this happening to other folks.