No Service on iPhone 6

I just got an iPhone 6 yesterday through the enterprise (I think? It's through a business, I know that much). Called the number on my old phone to activiate my SIM card on my new phone. I was told to shut off my new phone for 5 minutes while the network was activated. I did that and meawhile the network was shut off on my old phone. I turned my phone on after 5 minutes (and did this multiple times) and it still says No Service. Now I'm phone-less and can't call to see what else I should do. Any ideas?