As mentioned in another thread I have an iPad Air and am thinking of upgrading to the iPad Pro (probably 10.5) I understand the Pro comes with an embedded Apple SIM and an empty external SIM slot. Unfortunately, while I am in an area where various carriers work well, within my office building I have only had consistent luck with Verizon. I also understand that Verizon is not a choice on the embedded Apple SIM. So 2 questions: (1) If I purchase an iPad Pro from Apple, will I have a problem getting a Verizon SIM card for the external slot?; and (2) Will I be able to also use a carrier with the embedded SIM and switch back and forth between Verizon and the other carrier when I choose? (Specifically, I was wondering about international travel and the ability to utilize T-Mobile's free 200 mb of data if I run out of Verizon data in a particular month). I assume I could just swap the Verizon SIM out like I do on my iPad Air, but I was wondering if I could skip that step and just use the embedded SIM for the other carrier. Hope that makes sense.