Link  – open this link on an iPhone or iPad and download the Matador App. Create an account in the app, link your bank account and deposit at least $10 into your account. Within 5-10 days you will receive a $20 cash bonus in your account, which you can withdraw after 30 days. Matador is another app for free stock trading, and they also offer 2.5% interest on your money. They are SIPC insured.