Robinhood >Commission free and no minimum to open robinhood.com
>How is it free? Robinhood earns revenue by collecting interest on cash/securities and fees from their Robinhood Gold service
Interactive Brokers >$0.005/share, $1 minimum. Lowest margin interest. Free API access >Cheapest trading platform for Europeans, very good API, anal registration process interactivebrokers.com
TD Ameritade >$6.95 commission per trade. No minimum to open. Fantastic data/charting through their free ThinkorSwim service tdameritrade.com
Degiro >2nd cheapest platform for Europeans, they announced an increase of their commission fees. Very quick registration process degiro.eu
Think about this. ATT will not be going anywhere for a long time.
With 5G coming out soon, I'd say invest in ATT now, they'll only grow from here. I work doing telephone and fiber optic shit and I deal with ATT blokes all the time, they all enjoy working there, say things are pretty smooth