Based on my high regards for Panasonic products, I paid a good some for the KX-TC1890B. In addition, I needed reliability. Well, some days you're the statue and some days you're the pigeon and that day I was the statue.
Right out of the box, the phone did not answer three out of five phone calls. Either of the two lines would rang, I'd pick up the handset and - nothing! No matter what button I pressed (including channel), how loud I cursed, the dumb phone acted brain dead. Eventually I discovered that the speakerphone worked. That told me there was a communication problem between the phone and the wireless handset.
My biggest problem is the location of the caller ID and call waiting buttons on the back of the handset. They are located at the spot where I naturally hold the phone, and are frequently accidentally pressed, especially when I hold the phone between my ear and my shoulder. This causes a temporary and sometimes permanent disconnect (or what another reviewer called ''drop outs'').
Furthermore, although the phone looks nice and most features are intelligently designed, there are several glaring design flaws. First, there is no redial from the base keypad (one has to dial on the handset for redial to work). Next, setting the clock is extremely difficult, a much cheaper phone I had provided dedicated keys for setting the clock on the base. The Panasonic requires one to use multi-purpose program keys, for which I had to draw a flow chart. Third, although there is back-up for the messages, the clock resets after even a short power failure. Fourth, when listening to messages remotely, the voice prompt does not immediately allow one to delete just-played-back messages. It necessary to press the key for ''other functions'' repeatedly (about four times, listening each time) before the voice prompt offers to erase the already-played back messages.

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