Q: I have iphone 4s, wife has iphone 4 and I want to switch phones. She works and I am retired. She needs Siri. How can I switch phones so all data is switched correctly?

Are you using the GSM iPhones ATT or CDMA iPhones Verizon or Sprint? The process for GSM iPhone is fairly easy. The process for CDMA iPhone is more involved.

First make sure both iPhones are using the lastest iOS 5.1.1. Secondly make sure all of your data is backed up in separate iCloud accounts one for each user. Make sure that you are all of the options in iCloud are on. Then you have to switch the sim cards.

http://support.apple.com/kb/HT2309

http://support.apple.com/kb/HT5163

This page will take you though the steps of backing up data and then restoring the data on both iPhones. Make sure to read everything before you start the process it is fairly straight forward.

http://support.apple.com/kb/HT4137

You can use iTunes to restore or the iCloud option. I find that iCloud is much easier to setup but it requires wifi.