They should also try using older/slower phones that are representative of those areas. I remember that I had an LG L7 which was barely usable at all even freshly reset.
[0]: https://twitter.com/alexstamos/status/656582605173858305
Most don't stay with them for too long, though. It does really take an extra push to advance this. I had a Galaxy Young for two days after I cracked my normal phone's screen. It was kind of hellish.