Conventions are your friend (one of the reasons I hate the phrase "think outside the box"... think outside the box when coming up with a product or idea, think inside while attempting to make something usable).
Colored text is a convention for click on the web in general, so that works, but if you want it to continue looking like a mobile app and not a website, think about using a button or "pill" link with a call to action.
Barring that, I'd also look at a slight redesign of your area. I don't know what it looks like with multiple listings, but i'd suggest sectioning out each item and making the entire area clickable with a ">" arrow to suggest clickability.
A few options there.