How do I get curly hair with out velcro curlers or heat?

Keep in mind it has to be easy and effective. My hair has a hard time holding a curl.How do I get curly hair with out velcro curlers or heat?
try setting your hair when its damp with salon type plastic mesh or magnetic rollers and remember to use a strong setting lotionHow do I get curly hair with out velcro curlers or heat?
try braiding it while its still damp, and then sleep on it