How kan i do it?
Hi and welcome to the Forum,
This will depend on what OS your iPhone is on.
But may I suggest you visit our sister forum for this at iphoneforums.net
Please read the Forum Rules
iPad 2 64gb wifi/Cellular - iPad Mini 32gb wifi/Cellular - iPhone 5 - Apple TV - MacBook Pro 15"
Compare your iPhone model and iOS combination here. The tools that you can use to jailbreak that combination is listed there as well
iPhone 4S White 16GB iOS 7.0 || iPad Mini 16GB WiFi iOS 6.0.1
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iPhone Forums Moderator