Most mobile donations are made using sms text massaging.in one approach, the giver sends a simple pre-determined massage to shrot code specified in an advertisement or public announcement. A second text message is required to confirm the transaction. The donation, usually $5 or $10, is then added to the user's mobile phone bill. A variation on this approach involves user sending a SMS text message to a short-code number . In response, they are sent a link to a mobile Internet site that allows them to specify an amount they'd like to give. As with the previous method, the amount is then added to the giver's monthly phone bill. At the end of the month,the phone company sends a payment to the chrity for all the donation it has received.