Florida law makes no distinction about holsters. Under Florida statues, a "concealed weapon" is one that is "concealed from ordinary view", so if a casual observer doesn't actually see the gun, it's a legal way for a CCW permit holder to carry it. If you were carrying a pistol in an open-topped holster on your belt, without a covering garment, an observer could see the gun, and it would then be "open carry" and get you arrested. But the fully enclosed "cell phone" pockets cover ALL of the gun, just like a fanny pack, and are completely legal in Florida for CCW carry.