I just got a new Galaxy s8 and my contacts were copied over from the verizon cloud. I see in my messages that some numbers were not synced to the cloud so the numbers being shown are off. When I add the new number to the contact, it sows not allow me to delete the old one. It says you cannot delete contacts from read-only accounts, but you can hide them from contacts. This is very frustrating and i never had this issue on my own phone. When it asks me which number I want to txt, I have to go back and figure out which one is right. There has to be a simple way to clock update contact with the new information and delete the old. Also, I want this new information to go to the cloud.
I can absolutely understand how important it is to have up to date contacts in your cloud. Are you trying to sign in and edit them from your phone, or from a browser on your computer? If possible, can you try to use a computer to edit them?
Are you sure its Cloud contacts that you're unable to edit/delete, and not Google contacts? I only ask because as far as I know, that read-only error happens with Google contacts, not Cloud contacts, though I could be mistaken. Either way, the solution should be to log into your Verizon Cloud or Google account from a computer, and edit/delete the contacts there.