I have an opportunity to buy a cellular iPad Pro 10.5 (2017) that is activated and locked to the AT&T network. I am on Verizon, and my old cellular iPad Pro has a Verizon sim (activated). If I were to buy the AT&T iPad, could I just pop in my Verizon SIM card and the AT&T iPad would work on Verizon? I have searched the web and can’t seem to find a straight answer on this. Thanks for any info...