There is no button on this model of phone to automatically check your messages.
You will have to dial the access number that your local phone company uses to access the messaging system. On many systems the access number is *98 (Star 98) or it is simply dialing your own phone number, then entering your PIN number. Just check with your local phone service provider for the exact procedure in your area.
If you want, you can download the free manual for that phone from the following link:
http://www.retrevo.com/support/AT%26T-950-Telephones-manual/id/473ci257/t/2/
You may need ADOBE READER installed on your computer to read PDF documents.
You can download this free at
WWW.ADOBE.COM if necessary.
Click on the DOWNLOAD ADOBE READER button on right side of the ADOBE home page when you get there, the follow the onscreen instructions to install the software on your computer.
Good luck.