I have a feeling I may need to drive back to my brother's house, but he passed his iPhone 5s to one of my kids to use as an iPod. I took it home, performed the erase all settings on the iPhone (just like I do on my T-Mobile iPhone). But after the first or second screen setting it up, it says it needs a SIM to activate. He didn't leave his Sprint SIM in it...do I actually need to go back and have him pop it in, activate it, remove it, and then I'd be good? Or any other way around this to activate the phone without a Sprint SIM? Thanks!