I have recently jailbroken some iphone 3Gs mobiles and have made this quick cydia apps list for new setups as a reference.
I do not provide jailbreak instructions here as it is easy to google the solution, but as far as I know jailbreaking or modding your iphone is not illegal.
After your iphone is jailbroken install the following apps to make it better.
You should be on ios 4.2.1 as it is easily jailbreakable on mac and pc atm.
Sources: (add these sources into Cydia) without quotation marks
"http://cydia.hackulo.us/"
"http://sinfuliphonerepo.com/"
Note, these source repositories do have some pirated apps, but they hold much much more free and legitimate apps through user communities.
So it is up to you to support the app makers and not choose the cracked versions
With that said here are the top apps for customising your iphone 3GS and iphone 4...
Apps: (download using Cydia to search for the app and then install)
sbsettings
winterboard
open ssh
appsync
backgrounder
multifl0w
ifile
cydelete
five icon dock
iconoclasm
infinifolders
infinidock
lockdown pro
lockinfo + plugins
myos
installous
if you can think of other useful apps to have, let me know yo'
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