WaveShark

Connect to your smart phone via Bluetooth and have SMS-like text messaging completely independent of the Internet or existing cellular infrastructure. Alternatively, or in the event that our app is for some reason no longer available in app stores, connect your smart phone to the WaveShark using a USB On-The-Go (USB OTG) cable and send your messages using any serial terminal app, such as a-Shell for iOS. This method of use even works with your phone in "airplane mode" (cellular connectivity, Bluetooth, and Wi-Fi disabled).