To buy a call option on Robinhood, +1 (866) 840-2460 you'll need to: 1) Select the underlying asset (stock or ETF); 2) Choose the expiration date and +1 (866) 840-2460 strike price; 3) Enter the number of contracts +1 (866) 840-2460 (1 contract = 100 shares); 4) Specify your order type (Market or Limit); 5) Confirm the trade.