We needed something in our house because my husband has become hard of hearing. He's usually in one room and I'm usually in the room that is adjacent to it, and if we want to talk to each other I can hear him but he can't hear me. It was driving me crazy! Short of getting him hearing aids, an idea he was not embracing, we needed to do something easy to allow me to save my vocal chords from yelling all day long. Carrying real walkie-talkies seemed very impractical, but we always have our phones with us. TwoWay is free, so I figured we had nothing to lose to try it. I will agree with everyone who has complained that there are no instructions, because we were getting other people trying to talk to us… NOT acceptable. And even though one might be careful of what one says over this device, I got sick of this one woman who kept trying to talk to me EVERY time I said something. Not to mention that it is no one's business what we say to each other. TwoWay does say that you can talk to only those people to whom you want, and it seemed intuitive that, like a ham radio or any communicating device via radio waves, that both of you have to be on the same "frequency." Considering that TwoWay only has three buttons (well, four buttons if you include the TALK button) it seemed obvious that the icon with the little squares that pulls up a number had to be the way to "change your frequency." This is where it is very annoying that NOTHING is mentioned as to the correct number to choose, to make it private. Must it have all six numbers? Are certain numbers not going to work? Must it be within a certain range of numbers? And on, and on… It wouldn't have killed the developers to give the user a couple of sentences explaining what to do with the three buttons! This is where it lost a star from me. Anyway, it was easy to see that the geographical location should be put to our area, and that was easy to set. You just hold down on the map until your location is set to the center of the crosshairs. It can be just a rough guess, and it will work. As for resetting the number, we just chose an arbitrary six digit number to replace the one it comes with. Ours just happens to also start with a 3, so don't know if that makes any difference but I doubt that it does. Now that we have done that we have no more interferences from anyone else talking when we have TwoWay turned on, and we are very happy with it. The range it will carry between you and the other phone is amazing. The farthest we have used it so far is about 10 miles in the city of Phoenix, and it was loud and clear on both ends. If you have a need for an app to do something like what this does, go ahead and get it, and you will love it. I hope my simple explanations will help some of you who are having trouble with the "no instructions" issue. Great app!