For additional installation options and complete instructions that enable you to use all features of this telephone, refer to your AT&T CL2939 big button big display telephone user's manual. www.telephones.att.com or call 1 (800) 222-3111. In Canada, dial 1 (866) 288-4268. User manual for the device AT&T CL2939. Online user manual To start viewing the user manualAT&T CL2939 on full screen, use the buttonFullscreen. 1. User's manual. CL2939 Big button big display telephone/speakerphone with caller 26 May 2017 and quick start guides for cordless and corded telephones from AT&T. Please enter your model number in the box below to find the manual and quick startView and Download AT&T CL2939 user manual online. Big button big display telephone/speakerphone with caller ID/call waiting. CL2939 Telephone pdf Amazon.com : AT&T CL2939 Corded Phone, Black, 1 Handset : Corded Telephones base, power adapter, handset cord, telephone line cord, user manual User guide • Read online or download PDF • AT&T CL2939 User Manual • AT&T Handset Cordless Phone. Phone manuals and free pdf instructions. Find the user manual you need for your phone and more at ManualsOnline. AT&T cl2939 phone keeps displaying line in use. cannot get dial tone or use phone. Google (AT&T)(1830)(manual) without parens for instructions. Please thoroughly read the user's manual for all the feature operations and troubleshooting information you need to install and operate your new AT&T product. You can also visit our website at www.telephones.att.com or call 1 (800) 222-3111. In Canada, dial 1 (866) 288-4268.