A lot of beggars have smartphones nowadays. People will also start giving them older smartphones that they no longer need instead of money. But this is talking genuine begging. In many countries, begging is a form of organised crime and the criminals will make sure the beggers, effectively slaves, under their control will have smartphones to collect bitcoin.
Professional beggar may have smartphone and internet facilities, but the real bigger who even spend their lives from hand to mouth, they cannot get their livelihood, so for such people i do not think that they can use bitcoin or can get any access to bitcoin. Even in some backward countries the middle class people cannot afford the internet expenses and therefore they also do not have access to bitcoin.