Some columns become read only, such as a lookup drop down list.
One to many relationship column. Such as a list which store order header, but need to include order items possible or not.
Not yet. It came up in location column on iOS app
In Android it dissapears completely
the problem still exists with lookup columns being read only in SharePoint iOS app. Feb 14 2019 - happy v-day to whom it may concern.
Leonardo Santos commented
The problem was resolved?