Right now my main phone is the Google Nexus 5. It uses a micro-SIM card. I just bought the IP6S+. I have been very busy with work and haven't had time to go out and get a nano sim card. I opened the packaging and turned on the phone, but it won't let me get to the home screen. Is there any other way or I'll need to have a sim card inside in order to activate the phone and get to the home screen?