Debt collector calls to your cell phone are probably permissible if you don’t answer them. That’s because the important part about whether these calls to your cell phone are permissible is whether the debt collector KNOWS you don’t want them to contact you. But with that said, there are still reasonable boundaries to how often you can get called, even if you haven’t talked to a debt collector. If you are getting 5-10 calls per day, that would still probably violate consumer laws.