OK, in that case I don’t think stuff from my post will be a problem - especially considering titles you mentioned (thanks for that btw, I’ll have more things to check out myself).
I forgot to ask but what phone system are we talking about? I use Mihon with this extension file (basically, content sources), but it’s Android only.
Most of the things I read aren’t licensed in English but the official apps I know about are:
Manga Plus
Viz
Shonen Jump (already mentioned)
Can’t say too much about them unfortunately, as my main combo consists of Mihon + physical copies.