This FAQ list contains a collection of frequently asked questions and answers about the Ericsson T28 mobile phone. Details are sourced from newsgroups and Ericsson's web site. Please direct enquiries to me using this page, or e-mail lokety-at-gmail.com. Try out the Ericsson T28 poll here. If you would like me to add another choice in the poll, enter it as an opinion in that page.
Last update: 3 June 2007 1439hrs
Use any or all information in this page at your own risk. Do not try to disassemble or reprogram your phone unless you are sure of what you are doing. I do not work for Ericsson and any other company mentioned here unless expressed otherwise. Digest this page with a grain of salt, because nothing here is necessarily true.
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It is a mobile phone from Ericsson which was released in October 1999. At that time, the T28 defined the latest mobile phone technology available from Ericsson.
You can check that out by going to Ericsson's web site, mentioned above, or click on the following for photos taken badly by yours truly, using a Kodak DC240 digital camera. See more at the T28 Gallery.
97mm x 50mm x 15mm. Without a battery, it weighs 60 grams. It weighs 83 grams with the ultra slim battery included.
It is a battery technology which uses lithium as the energy conductor and a polymer substance as the electrolyte. Compared to nickel metal-hydride batteries, lithium polymer (LiPo) batteries are more efficient, weight can be 50% less, and volume reduced by 10% to 20%.
The polymer used is a moldable gel which can form irregular-shaped batteries. Thus, empty corners and gaps in the housing of a phone, for example, can be filled.
The LiPo battery used in the T28 has a lower voltage of 3V compared to many other phones' 4V or more. IMHO, it is the advance in lower power consumption of the latest semiconductor components, such as surface mount chips, that helps to increase operating times.
No. The accessories for T28 fit differently and contain intelligent circuitry which is used exclusively with the T28, and possibly future models in the T series.
The general idea is yes. Ericsson has something called a "high performance antenna IAT-10". Dr. A. Merrington has this to say about it:
"The details are for NPI (part of the Airstream network) in Michigan but I would guess its true for any service area and service provider.
If you are in an area with a reasonably good signal (a three or so on the T28 signal intensity meter), you will get a stronger signal. It will boost a 3 to a 5 (max). If you are in an area with a very weak signal (a one or so) you get a slightly better signal - a 1.5 (flashes between a 1 and a 2) to a 3. If you are in an area with no signal, it won't do a thing. I lived about half a mile beyong the signal limits from two towers and now, with the IAT-10, I get a weak signal in my yard. I still can't pull a signal into the buildings.
Is it worth buying? For me it was because, as a I said, I lived just outside the old service area, now I don't. The other thing I forgot to mention is that it seems to hold onto signals whilst driving in the car better with fewer dead spots. It offers an incremental improvement rather than a significant improvement but if that's all you need, then it'll work for you.
I used to run a 0.6Watt Motorolla Microtac with the 3Watt in-car booster. Now that set-up offered significant signal enhancement. The IAT-10 is not in the same league."
Here's a list of sites which sell this thing (some may be outdated):
Out of the box, the battery may have a little capacity, so you can play with the phone immediately after you exit the shop :-). You should charge the battery fully, which may take longer than subsequent charges. Some say that the first charge should be done for 16 hours. The important thing to note is that after the first charge, the performance of the battery is not indicative of its normal operation. Subsequent charges will bring the battery to its real performance.
After you have selected a number to add voice to, the screen will display the message to prompt you to speak after hearing the tone. By the time you selected the number, you should hold the phone in the position you would hold it when you voice dial in the future. Most likely this position is by holding the phone to your ear and mouth. It is best to record the voice in a quiet place.
It means the network has turned off encryption for your calls.
This is a common serious problem. Several possible causes are: faulty motherboard, faulty battery connector (the 5 gold pins). So far, anybody would tell you to go visit your service centre.
My own T28s was sent in for replacement because of this problem (Feb 28 2000). Customer service said that for new phones such as this, manufacturers tend to readily replace the unit. I'd suppose this is more economical and allows customers to have a better version of the unit. I was told not to overcharge the battery by disconnecting the charger immediately after charging is complete, but I'm not sure how that can help. I've got a Jan 2000 version of the firmware, which I'll put up some news when I find any differences.
This problem typically occurs after one or several months' of usage. Bring the phone to an Ericsson warranty service centre. If you want to fix it yourself, take a pair of long nose pliers, grip the round little stub on the right side of the flip and bend it upwards slightly (with the screen facing upright to you). You may want to hold the flip firmly to support the bending. Some folks say that this is what the service people do at Ericsson.
Paolo suggested a quick and cheap fix that uses plastic/super glue. With the flip open, put a drop of glue on the stub. Wait for the glue to cure completely; you may use a sheet of paper to check. Now, the flip should click when closed. My concern is whether the glue's chemical reaction with the plastic stub is a bad thing.
One point to note is that you must use only the flip release button on the right side to access the keypad. Do not use your fingers or thumb to pry open the phone as you would with the previous Ericsson phones with flips (e.g. GF788).
Check out www.nogi.net/gsm. It has a decent collection of melodies for Ericsson phones and a program that can play them on your computer before you enter it into your phone.
Ericsson has a ShockWave applet on their site. Look for "Tune Your Phone".
In standby mode, press >*<<*<* (< means left arrow, > means right arrow). From here, you can select the following:
Try this URL: <URL:http://www.gsmhacking.com/html/misiek/ericsson_cable.htm>
Please download directly from this FAQ site. There are two choices:
This is going to be the longest section...
It is a wireless communication specification set by several bodies, such as Ericsson and IBM. It features low power, short distance, and intelligent communication between devices, such as phones and palmtop computers, via radio (2.4GHz). For more information, see www.bluetooth.com and www.bluetooth.net.
Yes, some of you may say that it's a waste of your lifetime, but there are people who get really bored on the train or bus...
You can find more incredible scores at this site.
end of FAQ
Last update @ June 3 2007.
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