On Sun, 2006-07-16 at 23:03 +0800, Deepak Shrestha wrote: > For example, if I have to login to my yahoo through my very simple > mobile phone, I have to compose my message with my ID & password and > send it to certain number, then I can read my yahoo mails..etc. etc. > > What I wanted to know is: > > 1) What are the technologies behind these? > 2) Are Mobile Companies, Yahoo etc. are using *nix platform to > implement this? or there are specialized hardwares? > 3) Are there packages for linux for implementing this (I don't know > what to call this..."set of technologies"?) > > Seems ambitious but I really want to know first in nut shell. Can some > body guide me on where to find information and guide me to correct > path? > Hi Deepak, Your questions are indeed ambitious, but you may be barking up the wrong tree. First a few clarifications: 1. SMS is different from mobile web browsing. The way your phone sends SMSes uses a different path at the telco and different technologies from the way mobile web content reaches your phone 2. If you are interested in viewing or serving web content to mobile phones, you need to understand that for most Asian telcos, this is already accomplished with their rollouts of 2.5G networks. A 2.5G network normally contains servers and equipment that will allow web content to be re-formatted for different mobile screen sizes and displayed (not always correctly) on the mobile phone. The subject of how this is implemented is waaaay too broad to explain in one email. 3. For mobile web content, you will need a wireless gateway. There are several in the market. I have deployed Openwave's MAG (Mobile Access Gateway) product, which runs on UNIX systems. For an Open Source alternative, you may want to look at Kannel (http://www.kannel.org/). Be aware however that if you are going into GPRS and other wireless technologies for the first time, there is a rather steep learning curve ahead because of the alphabet soup of protocols to learn and understand and the infrastructure of telcos is not simple. If you are planning on implementing an entire 2.5G network for a telco, be aware that the job requires much more than just one person. There are many things to consider, such as data storage, billing, provisioning, maintenance, etc. Also, no telco I know of would give you the project if you are a small systems integration shop. If you are approaching this subject because you need to prepare for an interview, it may be best that you understand what your specific function in the organization is (application? database? network? systems?). If you need to write a web application that can be displayed on mobile phones, however, it is much simpler. Just use XHTML -- learn the syntax if you do not already know. Or display your application's output in XHTML. Most 2.5G networks will display that content without any trouble. (oh yes, avoid Javascript and test your pages using simulation browsers -- Openwave provides an SDK free with registration, if I recall correctly) Hope this helps. -- Pascal Chong email: chongym@xxxxxxxxxxxxxx web: http://cymulacrum.net pgp: http://cymulacrum.net/pgp/cymulacrum.asc "La science ne connaît pas de frontière parce que la connaissance appartient à l’humanité. et que c’est la flamme qui illumine le monde." -- Louis Pasteur
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