1. Customer types a message on their handset.
2. Phone uses in-app store to precharge customers X pence.
3. If the charge was successful the app sends the message to us/our servers.
4. We send back another message, either via SMS or via Push Message.
We can provide graphics etc. Basically, we're looking for an app that can send us a message and charge the customers for the privilege.
Skills: graphics, android-development