Systems and methods are provided to facilitate transactions via mobile communications. In one aspect, a system includes a data storage facility and an interchange coupled with the data storage facility that stores data associating a phone number of a user and an account identifier of the user. The interchange includes a common format processor and a plurality of converters to interface with a plurality of different controllers of mobile communications. The converters are configured to communicate with the controllers in different formats and with the common format processor in a common format. The common format processor uses one of the converters to transmit premium messages to the phone number to collect funds via a telecommunication carrier, receives a payment request having the account identifier, identifies the phone number based on the account identifier, and makes a payment on behalf of the user using the collected funds.