Swap SIM Cards from ATT iPhone XR to ATT iPhone 11
My wife and I currently have two iPhone XRs on ATT. I'm getting two new iPhone 11s, and porting my son and daughter's phone numbers over to ATT from Verizon. My wife and I will take the new 11 iphones and give the older XR iphones to our kids. What is the best way to swap SIM cards to make this transition as easy as possible? Should I activate the new 11 phones and them swap SIMs or swap SIMs then activate the new phones? Do I need to do anything after the swap to ensure SIMs and phones are properly assigned?