I plan on buying myself an iphone 12 online once my paycheck comes in. I have a cricket phone currently, which is not one of the carriers listed on the website, so I would technically need to get it SIM free so that I can use my current SIM card. However, my sister stated that she bought and iphone and selected the AT&T carrier and just used her Cricket SIM in the phone and it worked. I was wondering if this would also work in my case, since it would save me about $100. Any help is appreciated. Thank you.