SMS rules. Although I do wonder how a largely illiterate population reads them.
Haitians were increasingly spread out, moving into the city and overseas. They wanted to stay in touch and transfer money to family back home, and for a largely illiterate and remote population, mail wasn't the answer.
Instead of waiting for the government, [operator Digicel] built roads to many of its sites and kept its reception towers going with hundreds of generators. [...] All in all, Digicel has poured more than $400 million in Haiti [...]. Phone prices have dropped from $100-plus to just $10, with free minutes on offer. Yet the company is turning out a profit.
In the aftermath of the earthquake, the cell-phone companies have continued to provide the same level of corporate support, despite losing millions of dollars in equipment. They have provided free minutes for customers to call for help and reach loved ones. They gave out emergency aid in the form of shelter, medicine, food, and water, with Digicel Foundation spending more than $20 million on relief alone. And both companies now work with NGOs to provide cholera education in the form of text messages.