Can l use my new SIM card on the new phone l just ordered, and also ise the old phone with the old card?
No! Only one SIM card can be activate at a time. Imagine that if it's possible how many phones would be cloned
You can use the same card to multiple phones, however, you cannot have two SIM on the same plan. A plan (a phone number) is associated with only one SIM
Makes sense now, thanks!
Thanks for the best answer and have a good day ?