As of now, Digicel Haiti customers won't incur charges for the SMS tweets they send and receive through Twitter's 40404 short code. The bottom line is that Haitians can now experience an entirely free, mobile version of Twitter.
In Twitter's blog post on the matter, Biz Stone writes:
"Kevin Thau and our mobile team have recently arranged free SMS tweets for Digicel Haiti customers. To activate the service, mobile phone users in Haiti can text follow @oxfam to 40404. Accounts are created on the fly and any account can be followed this way."
Twitter's move to make SMS tweets free of charge comes more than a month after the earthquake struck Port-au-Prince, but it's yet another great example of how the web/tech industry is stepping up to help Haiti.