iphone 6 won't backup to icloud
My husband and I upgraded from iphone 4s to iphone 6. We used to share the same apple id, but ran into an issue where a contact would call him but it would appear on my phone was well. It was suggested to alleviate that issue that we should create a new icloud account. We use our yahoo email as our itunes/main apple id. I created a new icloud account for my iphone, but left the yahoo email as the itunes id. I'm still not able to backup my iphone to icloud. It won't do it automatically and I'm not able to do it manually. There is plenty of space. I have the free 5gb plan and only 2gb to backup. I've read through the communities and internet and itunes/icloud/iphone help, but haven't been successful. My husband's iphone doesn't have any problems backing up. Any suggestions? Thank you for your help!
Anne
iPhone 6, iOS 8