A decidedly average / lackluster cast, comedy, and story, Isekai plays more to a crowd looking for something fun and innocent than anything impactful light novel wise.
As stated above, this is an Isekai about a boy brought from his world to the Isekai, a fantasy world filled with magic but also stuck in a middle ages type era socially and culturally. The smartphone in the title is used in a few ways you might expect, but it's not really as much of a fail safe / focus as maybe the title implies, mainly because of magic being the better "Deus ex Machina" in most situations. I wouldn't say there's much of any one thing this does to hook you or that it does really interestingly / well. It's kind of breezy, but there's action and some close calls throughout, so it's not quite a chill out series.
Characters disappointed me. Early in the story, we meet some damsels in distress, and almost immediately after their situation is settled, they team up with our hero to form a party. It was just kind of sudden, and there isn't the sort of "love at first site / hidden affection" that maybe writers use to kind of handwave why the group joins together. I guess the main character's kindness is enough to trust him and want to partner up? Personalities aren't really that well defined, outside of maybe one or two you meet. I can't really say I've taken a liking to any of the heroines or our hero yet. The hero is too altruistic for me, though the occasional odd action / thought he has (like stringing paralyzed thugs up and taking a photo of their bare behinds to threaten them, or fearing marriage because of his loser cousin's advice about getting stuck with alimony) honestly make me more hopeful that this guy has some underlying issues or something so he's not just a goody two shoes.
There are some really odd non-sequitors in this one of a mostly older nature, specifically talks about the main character's cousin teaching him to fear marriage after his ex-wife took advantage of him for alimony support she used mostly for herself, female characters in the Isekai being "under the weather" at that time of month, etc. The rest of the novel is really breezy, so it's odd when this kind of stuff comes up.
Overall, this is not one I would go out of my way to read. Again, I kind of like characters with some weaknesses / quirks, and you won't find too many here. The one thing keeping me slightly intrigued is any hope of a romantic plot line developing between some characters, and any fun situations that could come from that. Otherwise, I don't really care too much for the plot, so I'm not dying for volume 2. I'm really curious how they'll adapt this into an anime though, if they'll play up more tropes / personalities.