They are certainly wrong but that doesn't mean this is lawsuit worthy in the slightest.
I'm sure there are people who returned android devices because of this issue.
Here is a hypothetical situation. My iPhone is lost or stolen and I haveto wait a few months until i'm eligible for a new Subsidized iphone. I decide to buy a cheap 100$ android to use for the next few months until I can get my new iPhone in a few months. After a week of missing text messages I think android sucks as they can't even text message properly. I decide to return the android and buy a new iPhone full price. If this or something similar has happened there might be actual damages at the very least I think there should be a DOJ anti trust investigation.