“If I wanted to use the SIM card from the phone I'm using now (OnePlus 7 Pro / T-Mobile) and just pop it into this one, which of the two buying options should I choose? Activate Today (Unlocked) or Activate Later (One-time Payment), or does it even matter?”
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One time payment
Sorry, there was a problem. Please try again later.Activate Later. If you choose Activate Today then you are buying a new line of service.
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