I purchased an iPhone 11 Pro Max from Apple two years ago. I told them I was a Verizon customer and they installed the SIM card and let Verizon know I had a new phone. I paid for the phone up front. Now I’m getting ready to order a new iphone 13 Pro Max and I would like to give my 11 to my granddaughter. She does not use Verizon. Can I do this without a lot of hassle. I think my phone is unlocked but I’m not sure. What do I have to do to give this phone to her and not create a major problem for her or me.