Can my otter box iPhone case help prevent radiation off my phone? - 1

So my mom just gave me her old iPhone 4S, but my step dad doesn't want me having a phone right now. (How should I tell him with our him taking it back? Cuz I still don't know anyone where I got PCS across the county an have no friends here still. It's been 2 1/2 weeks!) so I hide it in my shirt all the time. It has an otter box case on it but does it still give off as much radiation? Because my family already has medical issues an I'm already scared of those. I don't want to add another thing. It would be really helpful to know this. Cuz I don't know how much longer I have to hide this.

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