My previous "AT&T;" two-lin phone worked great for years. When I needed a replacement, I selected this supposedly similar unit. Big mistake.Lots of problems, but the major issue is the dialing. You have to dial at an exact speed, not too fast, not too slow, or your call won't go through. Incredibly annoying.It also makes a lot of random noises that are very annoying in a quiet office.This is another example of "features" prevailing over basic functionality. This is my last "AT&T;" product.