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You need to find the other side of the dents and get a small tool to bump it back out. They sell these tools online at newegg or your local apple authorized repair center. Just ask for the tool or else they will charge you a lot of money to repair it for you.
 
I am going to say don't do what was recommended above. Accidents happen. If mom and dad love eachother they will work it out. My wife ran my phone through the wash launch day (iPhone 4). I was really upset, but we got it replaced for $100 (Apple store felt bad for me lol). That's life.

But if you try and take the phone apart to "hammer out" the dent, you risk damaging it worse AND voiding the warranty.
 
He'll get over it. It may take a little while, but he'll get over. Men have fits over 2 things, denting their car, and messing up their electronics. :p
 
Make up an amazing story for it lol.

(Think of this in an australian accent)
So there I was mate, pitch black, naked as a new born with just my iPhone. I had had to drink my own urine earlier that day so I was woozy. Then what do ya know a fakin' polar bear was right there, so I threw my iPhone at him and what do you know, it hit its one weak spot, the self destruct button. This poor old bloke went BOOM, blood everywhere. Worst of all... my phone got This Dent.
 
Make up an amazing story for it lol.

(Think of this in an australian accent)
So there I was mate, pitch black, naked as a new born with just my iPhone. I had had to drink my own urine earlier that day so I was woozy. Then what do ya know a fakin' polar bear was right there, so I threw my iPhone at him and what do you know, it hit its one weak spot, the self destruct button. This poor old bloke went BOOM, blood everywhere. Worst of all... my phone got This Dent.

That had me rolling. Great study break.
 
As long as the phone still works, it really isn't a big deal in my opinion. Just encourage your mom to get a case for dad's phone.;)
 
Tell her to buy the case he wishes he could own, but didn't because of cost. Place the iPhone inside and tell him the story.
 
Hows come your dad doesn't use a phone case?

Obviously we all think the iPhone is a sexy beast, and want to touch it and show it off; but it's a prized possession and should be protected.

That's one reason why I don't get the overzealousness over colors; you SHOULD be encasing it anyways, not worried about showing off the gold really.

But that's me; I'm much more of a practical kinda guy than a materialist.

If you're worried about it's looks & integrity, slap a case on it!
 
C'mon... tell the truth..... you fumbled Dad's phone, didn't you?
 
... divorce.

Only kidding. Apple store is the way to go. If it takes a while to fix I'm sure your dad will be fine provided that your mum pays for the repairs.
 
It didn't break but it has little dents on the side of the phone. Unfortunate cause my dad was ABOUT TO buy a case for his phone so he was using it naked for the week (I know, what are the odds). She hasn't told him and I feel kinda bad. Any tips?

Get new mother.
;)

Put a bulky case on it to hide the marks. They can't be fixed.
 
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