Mario,
Much better! When making adjustments, I always tell people that you need to go "way" past where you think you should go and then come back in. Many times, especially here, the contrast could be pushed as I mentioned above. Depending on what editing software you are using, they generally all have sliders, that go both over and under the adjustment. These are still a bit "flat", so take #3,5 and push the contrast past where you think it should be (where JC did his adjustment) and then come back and somewhere in there, you'll see the improvement.
On images that are B&W and have an actual "white" and a real "black", you generally don't want to go to far. Your editing software may have a "eyedropper" thingie and you can hold it over the black and white areas and make sure for white, to stay below 255, I usually keep mine under 250 and for blacks, "0" is the blackest, so maybe "5" or so. Anything past these numbers and the printer won't see any detail, if there is detail there.
Keep shooting and don't worry WHAT you call your phone!
Rich