Phone reads number but won't call

[michellestraw5]

I got my keyocera from a third party it had a Sprint Sims card in it I removed it and placed my assurance wireless si. Card in it it reads the number but when I call out it says my account couldn't be validated what's that mean

 

[rgd1101]

MERGED QUESTION
Question from michellestraw5 : "My keyocera was with Sprint I got it from a third party I put my Sims card I. It and it reads the number but when I make a cal"

Do I have to call Sprint to help me