Locked vs Unlocked Phone With Prepaid Plan


    I've had the $30 Walmart prepaid T-Mobile plan for several years. Every time I've upgraded phones, I just bought an unlocked version and moved my SIM to the new phone. This time, I'd like to purchase a T-mobile locked phone directly from Samsung since it's $200 cheaper than the unlocked version.  I'm getting conflicting answers about whether I can do this or not.  The local T-Mobile store says I can, but T-Mobile chat says that I need an unlocked phone for a prepaid T-Mobile plan.  Can anyone give a definitive answer?

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