You just transfer mobile phone credit -- instead of cash -- to me and I'll turn on your mobile dialler account," he said.
But unlicensed UAE dealers register themselves overseas as resellers for the diallers so they can sell access codes to residents here.
I can use mobile diallers to call any mobile or landline.
The diallers are downloadable on many smartphone models and work over 3G and Wi-Fi networks.
The dialler requires access to the Internet and an account with VoipSwitch's Call-to-PBX and enables consumers to make and receive calls, use voicemail, dial from contact lists or record calls.
Communication between registered users is free and the Call-to-PBX dialler can use contacts from the iPhone.
A spokesperson for BT said that it has led the way in trying to tackle Internet diallers
, and has ploughed resources and time into developing new products - which it hopes will build on its previous efforts.