Even people in third world countries have mobile phones.
I have a love/hate relationship with it. Hate the spam and the tracking. Love the maps app. Yes, a paper map is good but it doesn't show where you are and if you are lost, well, that feature certainly is handy. And yesterday, when the car repair place called me to tell me the car was ready, I was able to call the courtesy driver, who also had a mobile phone, to pick me up and take me to my car without trying to find a pay phone. There are definite advantages to mobile phones.