Need to transfer Viber messages to new phone

[WPCentral Question]

I'm upgrading my iphone and have been using Viber to keep in touch with my daughter who is currently travelling around Australia. Obviously, these messages are very precious to me and I don't want to loose them when I get my new phone. Does anyone know how I keep / transfer them to my new phone. I've emailed them to myself but it's just as text in excel - ideally would like to keep them as they appear in Viber. Any suggestions would be really appreciated.
Thanks