I know with verizon you can just swap sim cards without having to contact them. But if i take my current sprint sim out of my unlocked iphone 5s and put it in an unlocked (paid full price on apple.com) iPhone X will it automatically work like verizon?
No it will not. You have to not only have the proper SIM card type (there are many different SIM cards with Sprint, just because they are the same size doesn't mean they will work in a phone), you have to get the IMEI of the phone associated with the SIM card either by doing it yourself online or by calling.
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Sprint and Verizon both have to have the phone in their databases before it will work. You will have to contact Sprint customer service to get the phone in their database.
Sprint and Verizon are completely different. You can't SIM swap with Sprint, you can with Verizon.
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do i have to go into my account and use the activate/swap phone feature.
You have to associate the IMEI of the phone with the SIM card number. But like I said, you can only do it if the SIM card is the proper type.
However, even when I have the correct SIM card type, I get an error every time I try to do it myself online and always have to call. It's so annoying.