How can I get my hair to curl?

I've tried:


Diffuser


Bigger curling iron


smaller curling iron





I don't want to use hairspray, it has curled with TONS of hairspray before with a small curling iron.


I also don't want to sleep in anything or buy hot rollers, they are too expensive.


Any ideas?How can I get my hair to curl?
try getting a perm , you can still go back to straight if you want to , hope it helpsHow can I get my hair to curl?
sleep with the curling iron