What iPhone plan should I get?

For a 18 year old teenage young adult. I don't talk on the phone much, I'm have a part time job at Krogers. Confused on what plan I should get though, advice? (keep in mind i'm still new to all of this thanks the current phone i'm using right now is a prepaid smartphone) Thanks.

30$ data plan.

I have an iPhone 4 and my carrier is straight talk, just 45 a month for unlimited everything. Its allright, Internet gets slow after a month

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