Waking up to phone ringtone, heavy sleeper? IPhone 5s?

So, I work at a 24 hour locksmith, and at night I'm on call, whilst also taking jobs during the day. At night, they forward calls directly to my cell phone, which is an iPhone 5s. Is there any specific product that you can recommend to boost the volume of my phone s ringtone? I'm a very heavy sleeper, and I have slept through a few calls.

I can't just sleep during the day, as most people have suggested, because like I said, I'm still taking jobs during the day. I just happen to be on call at night as well. Good money, but near round the clock work.

Any ideas are helpful.

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