Hello. I believe I have this right but wanted to check. I have a phone and sim all working fine but I’m replacing my phone and have just ordered a new replacement sim. I opted for a replacement sim and chose sim doesn’t fit as my current sim is smaller. I assume that my current sim will continue to work until I activate my new sim. I don’t want to be cut off and am working on the basis that my old phone and sim will continue to work until my new sim is here and I activate in my new phone.