Rating: 
Summary: 5.8 Ghz but STILLl uses 2.4 Ghz what gives....
Review: Bought this setup for a new house where I plan on installing a 802.11b network. I have not even thrown the boxes away and I am glad I did not. Was reading the manual, front to back, and was shocked to find the following information:Page 69 of 5840 manual, Titled: Technical Specifications RF Frequency Band (Handset to base) 2400MHz - 2483.5 MHz RF Frequency Band (Base to Handset) 5728 MHz- 5850 MHz What gives?? Why should you pay so much for a "5.8GHz" phone system when only half of it is 5.8 GHz. Check out the PANASONIC KX-TG5100M specs, that is truely 5.8Ghz, and is what I will be purchasing due to their honest marketing. Also do not like the fact that each phone has it's own Caller ID list. And why can't they sync the time up with the information on the CID. My free CID phone does this! Now for the positives: The phone itself sounds great even at a distance next to a computer. The display, and blue backlighting plus the general look and feel are well designed. So if you are look for a functional phone that looks great, buy this. If you are looking for honest marketing, don't bother. D
Rating: 
Summary: Getting closer to the perfect phone.
Review: I am a certified phone fetishist. After replacing cordless phone after cordless phone, I have now found one to keep for a while. The AT&T 5800 has the best speakerphone in the industry! You can actually use it in real situations! It has the now rare battery backup feature. I rotate batteries between the handset and the battery backup compartment when ever the handset battery runs out. By never putting the handset in the cradle, this "use it up every time" method makes the batteries last a year or more. Great memory and paging functions. You have to love the blue light! I have dropped it on hard wood floors many times, unlike any other phone or TV remote, the battery and battery cover don't go flying all over. Small but crucial details for the phone connesuer.
Rating:
Summary: Getting closer to the perfect phone.
Review: I am a certified phone fetishist. After replacing cordless phone after cordless phone, I have now found one to keep for a while. The AT&T 5800 has the best speakerphone in the industry! You can actually use it in real situations! It has the now rare battery backup feature. I rotate batteries between the handset and the battery backup compartment when ever the handset battery runs out. By never putting the handset in the cradle, this "use it up every time" method makes the batteries last a year or more. Great memory and paging functions. You have to love the blue light! I have dropped it on hard wood floors many times, unlike any other phone or TV remote, the battery and battery cover don't go flying all over. Small but crucial details for the phone connesuer.
Rating:
Summary: functional but not perfect
Review: I had a Sony multiple handset phone that I LOVED. Unfortunately, I found, when I moved into a bigger house, that the phone had been discontinued, and I could no longer get additional handsets for it.
I purchased the AT&T 5840 to replace it, and I suppose my disappointment with the handsets is probably more based on the fact that they pale in comparison to the former Sony ones, than that there is anything intrinsically wrong with them.
My primary complaints with the handsets are these:
1. The blue light that indicates that the handset is charging is bright enough to make it hard for me to get to sleep at night.
2. The caller ID lists incoming calls strictly based on what the phone company has in their system (i.e. "Cellular Call" instead of the name of the caller). The Sony phone would display a name for any number I had stored in memory (so if I had stored a number as "Annoying Guy" that is what the caller ID would say when that person called - and of course it also displayed my friends' names or nicknames as I had entered them too). This was particularly useful for me, as I have a terrible memory for numbers, and need a name in order to know who is calling. This is the feature I am most disappointed about losing.
3. The phone does not automatically store caller ID numbers in a format that allows me to call back with a single button press. In order to call a person back from the caller ID feature, I have to hit CID, then OPT #, and then select the appropriate number format. Although this process is not excessively difficult, it's annoying when I used to have a phone that allowed me to simply hit 'talk' to call a person back. It is also more difficult due to issue number 4 below.
4. The menu buttons 'wear out.' After regularly using the menu buttons for about a year, I have found that it now requires me to really push them hard, and sometimes several times, to get them to work.
I would recommend this phone to people who a) have a great memory for numbers and don't need a name listed on the caller ID and b) people who don't push buttons often. It does what a phone is meant to do, and so far, aside from the failing button issue, I have had no maintenance issues with it. I just became spoiled with all the features of my previous phone, and this one just doesn't come close in comparison.
Rating: 
Summary: Disposable
Review: I have the base and three other handsets. Best I can say is that they work. The problems would seem to have simple solutions--they must have rushed this to market without putting on the finishing touches.
Problems:
(1) The handsets don't synch with the base with respect to time, caller ID, and memory dialing. You have to repeatedly set the time on each handset. And caller ID only records on the handset where you take the call. Same issue with memory--who wants to punch inmemory dial numbers on 4 separate handsets.
(2) The text on the screen (numbers, letters, and a digitied analogue clock) look very Atari.
(3) The controls on the base simply stink--not intuitive and somewhat clumsy.
Pros:
The system isn't that expensive. Buy it, keep it for a couple of three years, and dispose.
Rating:
Summary: Perfect phone!
Review: I'm fussy about small buttons, hard to program menues, poorly lighted dials....this phone has none of that! The talking caller ID on the base unit is terrific and the plug in add-on units are very convenient. Very good reception, easy to use call log...I like this phone a lot!!
Rating:
Summary: Perfect phone!
Review: I'm fussy about small buttons, hard to program menues, poorly lighted dials....this phone has none of that! The talking caller ID on the base unit is terrific and the plug in add-on units are very convenient. Very good reception, easy to use call log...I like this phone a lot!!
Rating: 
Summary: 5.8 is really an improvement.
Review: I've been a cordless phone fan since the days of sub-50 mhz frequencies, and I've been using 2.4 Ghz phones around the house now for more than 2 years. They were really only a bit clearer than the 900 mhz phones they replaced, and their range was about the same. However, this high frequency seems to find itself isolated enough from household interference (lights, cell phones, etc.) to achieve real quiet! I would say the quality of the connection is almost identical to that of a corded phone. The 5830 setup was simple: Plug it in to the phone line and power plug (the fairly small transformer is nice too), enter the base ID # from the sticker under the phone, and you're ready to use the phone.
The menus are just okay; they may be a bit less than perfect but they're usable without instructions. Anyway, from the menu, you may (but do not have to) select ring style, ring volume, vibrate or no, and enter the time digitally.
I've added 2 of these 5800 extensions and these are set up just as the base is, but the number you register on each handset is that of the base unit. Range and intercom on the handsets are great, and the voice quality again is comparable to corded phones, though occasionally we get a hollow echo on a handset.
In both cases, the called ID display is very nicely done. It is lit in a very attractive and functional blue with a large enough display to read both the name and number without (my) glasses.
Lastly, the message waiting light (I use the phone company's voice mail svc) is easy to see from across the room, it too a cool neon blue that illuminates an "O" around the ear piece. The effect is quite techno-hip, as well as being highly functional.
In short, the 5800 series is a very nice execution of a very good new technology.
Rating:
Summary: 5.8 is Great
Review: This is the best phone I've ever had and at age 50 + I've had alot.
Rating:
Summary: Excellent
Review: Very good cordless phone. If I had to buy another I would do it again.
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