Hard to say that if in page 40 Renko's phone's is neither cracked or she's using it to see far into the edges of the rocks around the cavern? Mostly because in Page 8-9 Maribel's Cellphone seems to not be scratched... until page 24 at least, where we see her cellphone extremely cracked (and apparently, no longer working at all). This kinda makes me think that if Renko's cellphone was at least cracked before the adventure went awry or it became cracked but still functional after the fall, it's means that it's has gone within a few adventures with Renko around. That's what i want to believe at least...

Base +5

https://www.pixiv.net/artworks/93358633

Base +62