With this circuit we can controll up to 8 devices, by sending a specific SMS message with any mobile phone. Its very usefull at the cases that, at the place we have the devices, we have not a wired telephone line. If you have an old ericsson mobile phone and you are not using it, its the time to build some useful with that. The controlling that we can do to the devices, it is ON , OFF or Reset.
http://www.serasidis.gr/circuits/smscontrol/smscontroller.htm
This C500 windows mobile phone attracts dust very quickly. Here is a method that you can follow yourself to disassemble the phone and blow-out dust and other particles from your phone without making any damage to it.
http://www.digimission.com/?page_id=25
Getting the right handset is crucial to this build. The lucky thing is, the right handset means the right one for YOU. I will explore three different models of handsets, two that will work, and one that will not. Before you start, you need to take a look at your cell phone and identify how you would connect a headset to it.
http://www.i-hacked.com/content/view/205/47/
When Nokia announced their music player capable phones they neglected to mention the lack of support for external headphones. This mod includes an analog volume dial integrated into the push to talk unit. The HDS-3 cable ships with the 6230 and other Nokia phones capable of stereo playback.
http://cellphones.hackaday.com/entry/1234000220054587/
This simple project shows you how to make a USB powered Nokia cell phone charger. The advantage is that it weighs much less than the bulky AC adaptor, and can be used wherever you have a computer or a laptop. I use this thing all the time now!
http://www.walrus.com/~raphael/html/usb_charge.html
Just imagine: You can walk with your wireless phone chatting with Skype friends for free, you can make free call to your mom if she is connected to the Internet. You can make your telephone network with servises, voicemail, etc and chat there using your old phone. Skype wireless phones are expensive, VoIP adapters cost ~$60, but you can make it for free if your have details.. from old TV, Radio or other electronics.
http://www.vital.pri.ee/PSTN/
Also called Convert your chat-cord to a phone-cord. What the chat-cord does is to power a regular phone and act as a audio interface between the phone and your computer.
http://www.grynx.com/projects/telephone-archiver-tapping-device/
It works! From a telephone, it sounds indistinguishable from the real telephone network. When a call to another extension connects through, there is no click, you merely hear the dying oscillations of the bell as the handset is lifted away. Phones and answering machines of every description have been tried with this and all work fine.
http://wandel.ca/homepage/pbx.html
You have a computer, your friend has a computer, you both have a broadband connection, and you make use of Skype or like the voice chat in MSN or something like this - And - you’re sick and tired to sit by the computer all the time when you talk. And you might even sit with one of these ridiculous headset (hmm, yes I also have one) on your head just because the echo cancellation feature isn’t that great in reality.
http://www.grynx.com/projects/siemens-skype/
This miniature, 8-line home telephone exchange (PABX) works with standard telephones and features high-quality, user-friendly progress tones. Connection to telephones is via a two-wire unbalanced loop with a common ground. Only pulse dialling is supported although the exchange could be adapted to use a DTMF tone decoder.
http://www.holmea.demon.co.uk/Exchange/Design.htm