It wouldn't necessarily have to take place in any specified time - like Tim Burton's Batman movies that didn't really take place in any real era but a sort of gothic 30's-80's.
You don't have to say when it takes place, and you don't really have to show mobile phones or other time-specific technology, old or new. I think with something like the Turtles it's absolutely permissible to take a "style over realism" route.
A lot of the "80's grit" is how things were shot, lit, edited, styled and so on - and it's a big part of the Turtles identity IMO. Hard shadows, bright lights, all that.
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