I stopped using a cellphone when I moved to US --it was way more expensive than what I used to have in my home country (so I just simply said "nope."). Now when people ask my phone number, I just give my Google voice (which is free text/talk within US). If I am traveling to a conference, for the sake of emergency, I just use a potato phone with prepaid credit -- which I connect its number to Google Voice, so everyone who calls my Google voice number are automatically being redirected to my temporary phone. So I get that going for me.