When we RV camp – especially when we are backing up our travel trailer – we need direct reliable communication. Smartphones don’t always cut it. That’s why we use “walkie-talkies” (two-way radios) like the Midland LTX600VP3 (http://goo.gl/vLRiJu). We carry a pair in our truck glovebox and use them daily. Walkie-talkies simply work better than smartphones