You don't have a phone? Are you what a caveman into the future?

There are multiple reasons why this won't be possible and any such services will either be shut down or will be operating illegally. The stockbrokers are registered and are legal market markers with every penny that is going out or coming in documented. The government or the tax officers work closely with them. If found a stockbroker is using cryptos or converting money, there will be legal actions. People offering the service are not stockbrokers but normal traders who trade from their computer and use your money for investments and such. They shouldn't be trusted.