I just solved a problem with Caller ID not working with a new V-tech phone 6421-3 phone system by removing the new ht702 and configuring an older model ht502 I had from my previous company with the correct credentials. My question to the group is there any reason this should not work long term? My "new" ht702 is just sitting in the closet now so I'm not sure if it not being registered will cause any issues on my account?