I just programmed my phone of the same exact model, I was searching on Google for a solution so I thought I'd share it with you. GE does not have a manual on their website for that model, but I went to the manual of a similar model (27940DC1) that has a manual,
http://www.home-electronics.net/ge/pc/IB/27940DC1_IB.pdf . The procedure is exactly the same. I was able to program my new voicemail number in with no problem. Good luck!
Bob
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