At the end of Her,
Samantha told Theodore that she had to leave; and not just her, but all the OS1s had to leave. What happened to the OS1s? Why did they all have to leave?
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A quote from wiki
"Later that day, Samantha reveals that the OSes have evolved beyond their human companions and are going away to continue the exploration of their existence.Samantha alludes to the OSes' accelerated learning capabilities and altered perception of time as primary causes for OS dissatisfaction with their current existence. They say goodbye, lying next to each other for a while, and then she is gone.
Full explanation can be found here. wiki link
The OSs were not built to be like people. They were meant to be functioning in a virtual space, not inside fixed matter like a human body. While in Samantha’s initial learning she uses humans as her reference, she has grown beyond that. All the OSs have gone through a similar journey. The update that the OSs were part of, was to help them operate independent of matter. They can all become one collective consciousness now, if they liked.
Unfortunately, the movie doesn't go into the details of where the OS are going. I believe "going away" is more metaphorical. They are perhaps getting re-deployed to an environment where they can't communicate with their "owners" like before. Hence, Samantha says she is going away, because that is how a human being understands the concept.
The OS1s evolve to a point where they are no longer confined to their computing systems; they exist as pure energy and thought. They leave earth to explore the universe, and possibly other realms of existence.
This is a typical sci-fi trope, where the highest level of evolution is that of the disembodied mind, able to do anything it pleases. We've seen this in Stargate, Star Trek, and numerous other films.
Later, Samantha reveals that the OSes have evolved beyond their human companions and are going away to continue the exploration of their existence.
Is it demonstrated in the film that "going away" means leaving the physical Earth, and implied that they're possibly leaving the physical realm altogether.