Has anyone successfully used a prepaid phone and number for app registration?

I’m looking into getting a flip phone with a separate number so that I can sign up for a few apps that without associating them with ~_{the complete identity profile in the data marketplace that is linked to}~ my actual phone number.

To be clear, the apps will still be downloaded and utilized on my primary smartphone. But the phone number through which I receive verification codes during registration will be a separate device.

Has any one done this? Tips for selecting a cheapo phone and prepaid service?