It was very simple if the SIM card is included. Ours was attached to the outside of the phone box. Once inserted, we went to our Sprint account and followed the prompts to activate a phone. It prompted us to restart our phones and just like that it was swapped. Took about 5 minutes tops. One thing to note, back up your current iPhone before starting the process. When you start the new SE it will walk your through the setup and when you get to the point of putting in your Apple ID, it will offer you to use a prior backup. That is the quickest way to get ALL your content transferred over. There are tons of YouTube videos on how to do this. And if you run in to any issues, the online chat feature with sprint is very helpful.