How do I swap an unlocked Galaxy S9 for an old S5 on the t-mobile network?

bfk2333

    I am a long-term T-Mobile customer with multiple lines and devices. I have the opportunity to purchase an unlocked Galaxy S9 and want to use it to replace my current Galaxy S5. I do not want to make any other changes in my service. Can I swap the T-Mobile SIM card from the old S5 to the new S9? What is the process for making this happen?

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