Sim card usage and compatibility between Samsung Galaxy S5 and Samsung Galaxy S10+
I currently have AT&T as service provider. I have two phones, a Galaxy S5 and a Galaxy Note 4. I switch the sim card between the two phones, as I sometimes want to have the larger screen on hand, or the smaller screen on hand. I am looking at purchasing a Samsung Galaxy S10+. I still want the flexibility of being able to use my smaller s5, or the larger Note 4 or 10+ phone. I do not want a two line system, and having to pay for such. I understand that the Galaxy s10+ takes a different sim card. Could the new sim card for the s10+ be programmed to match what I have on my current sim card for the s5 & note 4, or would it be stated that I would have to get a separate line for the s10+, with its' new sim card. If that were the case, I would have to stay with my older and functional phones. I don't mind paying to new a new sim card for the s10+, that would be understandable. I don't want to have to pay for two phone lines on my plan, when I only need one, for myself.