Currently Being ModeratedDec 6, 2012 8:22 PM (in response to jahn05)
Post wrranty period you can take it into a service center and (wth exceptions) get the whole unit replaced with a refurbished unit for a flat fee.
If a problem arises with the repair they just did that is warrantied for 90 days.
Repair Pricing section - http://www.apple.com/support/iphone/service/faq/
iPhone model Out-of-Warranty Service
iPhone 5 $229
iPhone 4S $199
iPhone 4, iPhone 3GS, iPhone 3G, Original iPhone $149