I'm reasonably certain that who ever takes over the customer base will continue to maintain the contract. It is even likely they will be required to, and that's if they actually do fold.
I use a cheap ass LG with Tracfone. Great pricing for my minimal useage. Since the itsy bitsy little speaker must be perfectly aligned with the ear canal, I have to remove the hearing aid to use it as the microscopic microphones won't align with the speaker, and even if they did, they are located above the ear.