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Have you tried any of Kairosoft's games? Venture Towns and Edo Towns are two examples of city-building that I fairly enjoyed. Their sim games in general are really well done and have a good balance of challenge and simplicity. It's definitely adapted for mobile devices - it won't have the depth of City Skylines of course, but there's no IAP and it's still a lot of fun.
Although there's only one resource - money. Not sure if you like that or not.
LinkMe: Venture Towns
This is a Kairosoft game, so it will have certain gameplay mechanics that you may/may not like.
EDIT: The bot screwed up. Here's the link
All games by Kairosoft
But Venture Towns is closest to SIM City (though not similar enough).