Grounded for almost four months?

On June 1st my mother and I had a large argument and I ended up calling her a b*tch and screaming at each other and I told her someone should just kill her. I apologized immediately afterward, when she started to cry. I know, it was wrong but I was EXTREMELY ANGRY. My father took my iPod touch away. He never sets precedents, like how long the punishment is. Well now it is about to be 4 months since he took it away, and he is getting the new iPhone 5C this weekend. Should I ask him for it back? Do you think it's been long enough? I learned my lesson, I have been nicer to them both, trying to get closer to dad, etc. I NEED to listen to music when I study and to relax, and my little replacement MP3 just died, and I don't have any other way to listen on the go. How should I proceed to ask my dad for it back? Help is much appreciated.

Added (1). I do understand the gravity of what I said. I have empathy and put myself into her shoes and my father's shoes, and I can see that his punishment is perfectly suited.

I think your dad wants you to earn it back, and I guess You should tell him

When I first read your question I was like: that sucks. Just ask for it back and be like. What do they call it? Mature? Make sure he knows you feel.bad.

Keep in mind, that when i saw this, I don't mean to sound like my mother, no matter how much I do, but what you did was extremely wrong, and you said you learned your lesson, but did you really, or do you just want your ipod back, and then everything will go back to the way it was? If you really think you did, then you should ask him if you can have it back, but not directly. You could say, I know what i did was extremely wrong, and i feel terrible about it. You have every right to throw my ipod away for the way i treated you and i wouldn't blame you if you did. But neither of us is happy in this situation. What can i do to make it up to you? But if you are just going to say this to get your ipod back, if you really don't mean every bit of that, than you can't say it. There's no point in building a broken relationship back up with lies. This can't just be about the ipod. And i think you've realized by now that there was a reason he took your ipod away. It's called punishment for a reason.

The first time someone says they have learnt their lesson i.e. Now they haven't but are just wishing normal life back. Its after 4 months that actually you will never do anything close to wrong again.