Carlisle police are warning borough residents of a phone scam. There have been several calls received by borough residents by a company called Maximum Service who have been offering chimney inspections and cleaning. The company is informing residents they are working with the Carlisle fire department. The Carlisle fire department is not associated with this company. Carlisle residents are being asked not to respond the these calls and to contact the Carlisle fire department or the Carlisle police department if it does occur.