SMS Click app for iPhone and iPad
SMS Click is an app that allows you to send text messages using your Clickatell account which can help you to save money while texting. You can either enter a phone number or select one from your address book remember to include the country code.
SMS Click also features a history view where you can browse and search all your previous messages.
In order to be able to use this app you have to have an Clickatell Api Account.