1) Look on some online forums, such as: http://www.answerbag.com/c_view/2631 http://bt.custhelp.com/cgi-bin/bt.cfg/php/enduser/cci/bt_catpage.php?p_sid=&cat_lvl1=760&cat_lvl2=854&cat_lvl3=1061&p_cv=3.1061&p_cats=760,854,1061 2) Some schools propose courses about this, for instance this one: "This programme is targeted towards technicians in the telecommunication industry and anyone aspiring to set up TV/Radio/mobile phone services retail shop. Candidates will acquire skills in repairing and servicing mobile devices such as hand phone, PDA or Computer CPUs using mobile technology." Source and further information: http://www.lifelonglearning4u.com.my/EDMobileComm.html 3) Here a software explaining this: "This award winning electrical training application teaches a proven systematic troubleshooting approach called the "Five Step Troubleshooting Approach." The process is explained using animated graphics and text. Once familiar with the troubleshooting techniques you can work through a section that guides you through this troubleshooting process on a simple lighting circuit. You can then try to solve 20 faults on the lighting circuit. " Source and further information: http://www.softpedia.com/get/Others/Home-Education/Troubleshooting-Basic-Techniques.shtml

try applying for a job with a mobile phone company. they usually have very in depth training, tend to pay pretty well, have good benefits, etc. Most sites for the major carriers will probably have a link for job listings if you look. You could go to school, or do it for free while getting paid. Trust me, there's no better way to learn about fixing phones than to fix 40-50 of them per day, lol. try www.t-mobile.com/jobs. I'm sure there are many others.

Try the manufacturers website...