convincing my parents to let me get iphone?

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ok I got a super catholic mom and a catholic dad, religion does matter in this so please go with it...
first off there only concern is the internet and porn...
I haven't and they know this looked at porn in awile now, it just really truthfully doesn't interest me, and kids these days have ways of looking at porn anyhow

also I would be paying for it all myself as I have a job, im 17, getting a permin, and want to be more social and stay connected with people... right now I just have those talk and text phones and I really need an upgrade, any advise on how to convince them?

also: I want to avoid filters on the iphone and **** like that because my computer wont even let me use google images or anything like that for when im doing things, i want to make an instagram and that wont work with a filter