Reactivate my old boost Galaxy j7 perx that I transfered number off of to new phone.

Jul 19, 2018
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I had a galaxy j7 perx with number ending in 1699. I transfered the number over and put the j7 sim into new (already used boost phone galaxy j3 Emerge but deactivated idk original number). How do I reactivate the galaxy j7 perx with a boost sim that isn't in use or active currently, on the secondary line in MY account (I'm primary account holder)? The Stylo 2 that was active on secondary line was ran over on accident bc husband didn't know he dropped it or ran over it until back home from work. By then he picked up threw out didn't grab sim or look. So now I need to activate my old j7 perx with a boost Mobile inactive Sim.