I am a Manager at Sprint if it says invalid or locked sim either it is not activated, the wrong sim was put in it.. There is a misunderstanding that you can take a sim out of your old phone put it in your new phone and Boom done.. That is not true with our provisioning. Sprint activates with the imei and SIM card is like a tiny antenna that picks up the 3g, 4g, 4glte, 4glte advanced, 4g lte with Volte and 5g..
You can't use same sim fro. iPhone to android or even say an S7 to S8 ... yes its confusing..
Have the store activate it or if they said it is activated on your dial pad dial. ##update# and that will reset the provisioning
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