Repair your own phone
Repairing your cell phone at specialized services can be expensive, so if you have the skills and you know about electronics and you enjoy fixing things you can do it your self.
The first thing you must do is to find a technical guide for the mobile phone you want to repair. To do that just search in you favorite search engine for telephone model + technical guide or repair guide (ex. Nokia 1100 repair guide). The best part is that usually you will find illustrated instructions and if you search a video site like youtube.com you can find how to videos.
Now since you have the technical guide and you know what you must do to repair the phone you will need Electronic Parts. Online shops will help you in finding the parts you need.
From all the electronic parts the integrated circuits are the most important. Integrated circuits are used for a variety of devices, including microprocessors, audio and video equipment, and automobiles.
Integrated circuits are often classified by the number of transistors and other electronic components they contain: SSI (small-scale integration): Up to 100 electronic components per chip MSI (medium-scale integration): From 100 to 3,000 electronic components per chip LSI (large-scale integration): From 3,000 to 100,000 electronic components per chip VLSI (very large-scale integration): From 100,000 to 1,000,000 electronic components per chip ULSI (ultra large-scale integration): More than 1 million electronic components per chip.
If you have trouble finding the parts you need there is a website specialized in Hard to Find Semiconductors that you can visit.