Used, tested, and working. This may also work for other Panasonic phones from this era (the GD-55 came out in 2002) but I can't find much information on it. These are some of the models I believe it will also work with but please double check to make sure the plug and voltage is the same: G50 GD50 G51 G55 GD55 A100 A101 A102

Let me know if you have any questions and I'll do my best to answer them!