The idea is simple and could be a huge success. Why are the dumb phones not fitted with WiFi. It does not have be that fast however you should be able to make voice calls over the Internet with it.
With WiFi also on the dumb phone. People who would benefit the most. People who don’t have that much money could use this below 20$ dumbphone for calls to their relatives in other countries.
I’ve seen feature phones with WiFi but they cost as much as smartphones. The biggest impact should be if you fit dumbphones with WiFi.
I think its a right to be able to stay in touch and up to date with your family.
Also Internet access needs a Internet ready device. Then Wi-Fi on the dumbphone makes a lot of sense.