Why can't use wifi for my icloud backup?
You need to be on Verizon's data stream to have backup access to the Cloud. I would try a Google Backup as it's very easy and stable to use. To do a Google backup:
To start your backup: Sign in to your Google Account from your phone and do the following:
Go to Settings, Personal, Backup and reset, and. select both Backup my data and Automatic restore.
Go to Settings, Personal, Accounts & Sync, and select your Google account
Select all of the option boxes listed, to ensure that all available data is synced. After backing up your information, you will be able to set-up and sign in to your regular Google account from your any Android phone and all of your information can be saved and transferred.