Collections are not a magic recovery tool. If they were, business would be much more aggressive with them.
I can understand those with good credit ratings fearing collections. It does ruin credit ratings. But the kind of person who's going to skip on paying off their phone is the same kind of person who has no fear of collections.
It's possible to live cash only. I've done it since 1994 and only got credit cards back two years ago. Collection agencies main tool is harrassing you by phone. It's easy to ignore them if you only answer calls from people you know while blocking their numbers. They cannot come to your place of work, they cannot come to your residence. If they call you and you answer and tell them to f**k off and never call again they have to abide by that. Since they cannot legally garnish wages they eventually go away because they have no legal authority to interfere with any of your finances.
Thus, the debt gets sold to back and forth to another collection agency and the process starts anew. But past seven years zombie debt dies off.
A fate worse than death for those with good solid credit scores. Part of the way of life works for people who quit paying on their phones.
If you're dealing with collection agencies - they don't scare you.