I'm thinking of signing up for the T-mobile 5GB/5 month promotion on my iPad Pro. I assume I can do that on the iPad and it would utilize the embedded eSIM without the need for a separate T-mobile SIM card. Is this correct or am I confused about how this works? If I were to set up the T-mobile account and then put, say, a Verizon SIM card in the SIM slot, is there a way to switch back and forth between the T-mobile and Verizon services (i.e., choose which service I want to use for data at a particular time) or can you only activate one at a time?
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