How can i unlock my iPhone 6 ? I forgot the passcode and I dont have a laptop

You must try to borrow a PC or Mac. Unfortunately, it is not possible to restore iPhone 6 to factory settings if you have forgotten your passcode.

You can find more useful information here:

If you forgot your iPhone passcode - Apple Support

You will need to use a Mac or PC to reset the iPhone 6 and then set it up again. If you have an Apple Store in your area, you can use one of the Macs there. Public libraries also usually have computers on hand.

Chances are, you have a friend with a Mac or PC who will let you use it for 20-30 minutes.

If you forgot your iPhone passcode - Apple Support