I have a Samsung Galaxy S9 which I believe can take either a CDMA or GSM SIM card. I currently am using a CDMA. However, I am planning a trip out west and I noticed that GSM has better coverage with Republic Wireless out there.
My question is: am I able to swap in a GSM SIM card from Republic Wireless into my phone for the duration of my trip while keeping my service going on my CDMA card for when I get back? I want to keep my current phone number tied to my CDMA card.