How can you charge your phone without the charger?

I'm srry there is no way to charge your phone without a charger altho u can always get another battery for back up also there are myths saying you can put the battery out in the sun for an hour and it will charge another myths is you can rub the battery to your hair which causes friction and static electricity which is suPposesed to charge the battery but let me tell you I have never tried the myths soo I don't no if they can be done