do i still need a sim card for an unlocked phone?

D.G.Món

New member
I bought a use t-mobile phone and it came without the sim card. When I turn it on I get the message on the screen that says "insert sim card". I got a code online and was able to unlock the phone, but it still tells me to "insert sim card". I thought I could use the phone right away once unlocked, but I guess not. What can you tell me about it?
 
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