Not sure how to proceed on this.  I currently have an iPhone 4S, and my wife has an LG Cosmos Touch.  We are both due for upgrades.

I'm looking to upgrade to an iPhone 5S, with her switching over to my 4S, while at the same time changing our plan over to a Shared 2GB Data Family Plan.

Problem is, i'm not sure how to make all of this work!  I'm thinking that I should upgrade my phone to the 5S and get a new plan first, then switch her number and contacts over to the 4S.  What i'm concerned about, however, is if I will have any issues getting the 4S onto the data plan after switching to the 5S.