The length of the arcs (compared to the very short trailing of the actual star images over each 30 second exposure) suggests that these are trails of actual moving objects.
Welcome to the Starlink era. While your phone isn’t (yet) set up to use the Starlink network for communication, it appears it’s well capable of detecting the satellites by their reflected light.
I can’t be certain these are Starlink birds, of course — but they’re very numerous, in low enough orbits to move significantly in 30 seconds, and even the newer, “darker” ones reflect enough light to make them comparable in brightness to dimmer stars.
This kind of thing is why some astronomers have been complaining (since the second or third Starlink launch) that this network and its competitor(s) would be the end of ground-based astronomy, even as we approach the ability to build telescopes (or telescope networks) capable of resolving surface features on exoplanets.