We already had a version of this phone a few years ago and have since moved to a larger house. Thus, the original three phones were not enough. Then we lost one of the phones and there were only 2 left, so we finally gave up and started looking for additional phones to make our lives a little easier. We found them simply because they matched the AT&T phones we already have (the serial numbers don't match exactly, but that's ok, these phones were built to replace several different versions of AT&T phones, and ours was on the list). Anyway, we got the new phones, just set them up and they've been working flawlessly ever since. No complaints. Just make sure that when you get them you know they are extra phones and for them to work you must have already bought a base set to plug into the phone cord. (The extra handsets don't plug into the main phone cord, they just plug into a regular wall jack and somehow wirelessly sync to the main phone, which you should already have.)
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