Summary: Check your Base Unit for capacity to add additional handsets. I bought 2 additional handsets to add to my existing 4 handsets because I wanted to have a total of 6 handsets. The First new handset was added quickly and easily (follow the instructions). Adding the First new handset put a total of 5 handsets on the system. I followed the exact same instructions to add the Second (6th handset to be on the system). The message said "Failed", or something like that.
Summary: Bought this phone to use in the basement. I have the matching Vtech answering maching and phone. Only problem I have with the phone is that is doesn't quite get load enough for my mom who has a hearing aid.
Summary: I had one phone go bad and this was the easy solution to replace the broken phone. Just charge up the new phone and follow the instructions and you are back with a new working phone added to the system.
Summary: So far, so good. Got the base as a Xmas gift, so I purchased 3 more to have one in almost every room. My 79 yr old mom finds it easy to operate ... Getting & deleting messages & the numbers are illuminated ... And they were so reasonably priced. Ordered online & picked them up at a nearby Walmart with no problems. If I buy more, it will be through Walmart. Just wish they were available in red, like the base.