Anvil Mobile has launched a hybrid service that aims to encrypt mobile voice calls and protect incoming calls from local interception.

Its Secure Mobile service ensures call privacy and security across any mobile or wireless network when made to another mobile or landline number, it said. It runs on any smartphone with Android 2.3 or later, and on iOS 4, 5 or 6 and communications are protected with advanced 256-bit AES encryption.

Ian Philip, CEO at Anvil Mobile, said that to make a secure call, the user selects the icon from the phone screen or it can be set as the default so that all calls are made securely. “Whether it is to compromise intellectual property, overhear details of mergers and acquisitions or listen into the private conversations of celebrities, politicians or business leaders, it is simple and inexpensive to set up a rogue base station to intercept and record calls,” he said.

“The only sure way to avoid the risk of being listened to is by encrypting the calls; but until now that has meant both parties needed to have special software on matching secure mobile phones. Secure Mobile overcomes this limitation with any call to and from any number being locally secure. Voice interception is not an ‘if', it is a ‘when, where and by who'."