You might consider talking to your surgeon about micro-monovision before having your 2nd eye done, which is setting the other eye to focus just a little bit closer in than the first eye to give you better near vision. Studies show that with for instance the other eye set to focus at -0.5D people average better than 20/20 distance vision but have a bit of a boost in near vision, which might be enough to make your smartphone readable at a more comfortable distance. The issue is that the difference is much smaller than full monovision so there is less reduction in things like stereovision since both eyes are used for most things still. Unfortunately results from studies are just averages and not guarantees, a small minority of people do wind up needing reading glasses for near with the Symfony. Even the eye set for its best focus at -0.5D still average distance vision in that eye between 20/25 and 20/20 according to their charts, which leaves binocular vision better than 20/20 on average.
I don't recall seeing any results on how long it takes people to get the best near vision with the Symfony. One surgeon commented via email that neuroadaptation is slower with the Symfony than with the AT Lisa trifocal, but he didn't quantify the difference. I've seen reports that some multifocals reach their best results in a few weeks, others several months, and it likely depends on the person, and I don't know how the Symfony compares. In my case I think I was lucky and had 20/25 near in the first week (from my bast eye, the other was left a little hyperopic, a laser tweak to micro-monovision might help) at my best near distance, but I can read my smartphone at a comfortable distance, I don't feel like I need to hold it out further than normal.
Studies show night vision artifacts are reportedly about as common with a monofocal as with the Symfony, but unfortunately a small fraction of patients with any IOL will experience glare, halos, flares, etc. Many patients who see issues during the first few weeks see them fade as their eye's finish healing and they adapt to the new lens, but everyone is different. You may likely see the issues reduce over a few weeks or a few months, though unfortunately some tiny percentage will continue to have issues.
I would give the reading glasses a little time
I had symphony lenses planted in both eyes four months ago and I have found my near vision has become near perfect over the last couple of months