I just restored a new phone from an old iPhone backup. Everything is working except I can't dial out or use my phone features. It just says "No Service". How do I fix this so that I can dial out and receive calls? I'm currently using a 6S and used an old iCloud backup that was from a 5. Im up to date on all software updates. I've tried erasing the phones contents and starting the backup all over again but that didn't work. Help?