I looked at the Lumia 635 while I was at the AT&T store having my new sim card activated with my Lumia 1520 phone number in my old iPhone. I thought it looked great, but at $99, thought it wasn't a good idea for my temporary needs. So I was able to restore a year-old backup to my iPhone 4 and was able to add my Yahoo, Gmail, Outlook and work email accounts and synchronize my contacts quite easily. However, my text message history begins from about a year ago, and I was not able to figure out a way to get the messages from my Lumia.
Thanks for the suggestions. Looking forward to getting my Nokia back.