PRL 60611 works fine in
Southwest Michigan where I've tested it:
Portage, Kalamazoo, Comstock, Vicksburg, Three Rivers, Mattawan, Lawrence, Paw Paw, Plainwell, Allegan, Richland, Battle Creek, and Hastings.
In a way, I agree with
codyppc, PRL updates can be over-rated and creates an expectation that it will fix all your issues. It's literally just a list of towers to pull from based on roaming agreements. In some cases, it will help, in most, you won't notice a difference.