You always have to wait 3 days unless you have an account balance over $25,000... It is not an individual brokers rule but it is considered a "free ride" under Federal Reserve Regulation T... This is enforced by all brokers... There is no way around it...
If a particular stock was bought using settled funds, you can trade it immediately if you like. If it was bought with unsettled funds, you must wait for the unsettled funds to clear before trading... The guideline is not what day the stock you bought settles as that is always three days but what day the funds you used to purchase it with settle... Hope this makes sense and doesn't confuse you...
A lot of guys state that a margin account is a way around this but that is not true... Even under a margin account, if you shaow a pattern as a day trader, they will still whack your pee pee...