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The MGive Foundation has raised more than $4 million for Haiti via its wireless campaign, CNET reports. People have been donating in $10 increments by texting "Haiti" to the number 90999. The U.S. State Department and the Red Cross set up the Haiti campaign through the foundation. If you'd like to make more than two donations via texting, check with your mobile carrier first--most carriers only allow a maximum of two text donations per month.
If you're looking to contribute in another way, Wyclef Jean also has a relief campaign for his native country. You can donate $5 by texting "Yele," the name of his charity organization, to the number 501501. You can also donate online, if you want to contribute a greater amount.