iPhone and iPad Books in Sync

Can't find it in the forum so ... does any one know how to keep a book I am reading on my iPad synced on my iPhone? I have the book downloaded on both. I am reading the book on the iPad and awhile later, have some spare time some where but am without the iPad. But, the book is not at the same location when I bring it up. How to I keep them in sync? Thx ahead of time for the help!

Interesting. As Lynden says there are problems with sync but not sure it causes this problem. For example, I have a book downloaded on my iPad and Android phone (I don't have an iPhone) and the page location is maintained between them. Can you provide any more details? Graham

I am a bit embarrassed having posted this. I went back to try and provide additional information and cannot replicate the problem. Both iPhone and iPad seem to be syncing now, where they were not before. I shall keep at it as I would like to try to figure out what was happening before. Thank y'all for the feed back. If/ when I get new information, I'll post again.