Why Is My Boost Mobile Service Not Working

I have called their customer service which taken more than half an hour to go through a million times, but of no use. I got a boost mobile i425 phone earlier last week. So we both have an account with Boost Mobile in which for a couple of months seemed to be fine but then somehow the sim card ended up lost out of his phone (which is not itself the fault of Boost. Network issues - Got to Settings