Making a picture look old with grain?

How do I make a picture look like old and with a little bit of grain on my iPhone. I would love to know some apps that would help me edit my photos to look like this. I have a few examples.

1.) Making a picture look old with grain - 1

2.) https://mobile.twitter.com/chloeeast/status/916873388836249600

The first two google gave me (searching grain filter iphone):
https://itunes.apple.com/...92126?mt=8
http://lifeinlofi.com/2015/11/10/add-grain-and-dust-to-iphone-photos-with-rni-films-update/
and here is the 100 top apps for grain:
http://appcrawlr.com/ios-apps/best-apps-grain-effect

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