Need advice getting something i really want?

Okay, well my mom and i were going to switch to a phone service carrier because she thought that it would be cheaoer then the one we had now. I had planned out getting allowance specifically so that i could pay for my phome every month. I'm getting an iphone, and i have been wanting one for along time so i really want this to happen
I have been working on this whole idea for almost a month and when my mom said yes, of course i was really happy. But then yesterday me and my mom got in a fight over something stupid and i got mad so i started being and acting super immature and finally my mom said that was it, that we werent switching carriers and i wasn't getting my new phone
I would of asked for another chance, but something similar has already happened before and she gave me another chance. I haven't talked to her about it since we have sorta made up, and i'm willing to do anything to fix this so we can still go through with it, since i'm pretty sure we will be switching next week.

Any ideas what to do?
I already told myself that to try to fix it i was going to listen to what my moms says and do it and continuewith my chores so i can still get allowance and pay for it? I also want me and my moms relationship to go back to the way it was yesterday before it started.
Thank you and full points to the best answer.

P.S - sorry for any typos i'm typing on my phone

Apologise and admit that you were wrong. Then ask her very politly and do what she wants you to do as you said

WHAT EVER YOU DO, DO NOT GET ANGRY AGAIN, IT WILL MAKE BYOU SITUATION A MILLION TIMES WORSE!

After that I think eventually you should get what you wanted, if you were a hood child

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