Long story short, I plan on getting an iPhone XS with T-mobile real soon. I am going to get it with monthly payments, but more than half will be paid by January. I got lucky last year and T-mobile unlocked my phone as I paid a decent portion of it at once. I plan on traveling for Xmas break, and as always I just put the same prepaid local sim card that I had for years, and remove my t-mobile sim card. Now that eSim is available, can I use both at the same time and ditch the old sim card I have? Does having eSim mean that my phone is technically unlocked with the 2nd sim? Or does my particular prepaid sim card need to be eligible for eSim with this particular carrier? Thanks in advance!