If you receive unsolicited calls from creditors on your cell phone, you might be able to receive $500-$1,500 per call. The call must be unsolicited. This means you did not ask the creditor to contact you. If you applied for a line of credit or credit card and included your contact information (as is often required) this act is considered an invitation to contact you. In which case, when a creditor contacts you they are not violating any laws.
To avoid calls from creditors on your cell phone, prepare a letter explaining this and send it to the creditors. You can also call and ask to be placed on a 'Do Not Call List,' but writing a letter is a better method as you can provide it as evidence should you pursue a claim against a creditor.