We run a service that authenticates the sender of a text message - this allows financial transactions to be executed via text.
In a nutshell, when a registered customer sends a request to our service which requires authentication we immediately call them back using our IVR platform, read out the text using Text-to-Speech and ask them to authorise by entering their 4 digit PIN.
We have an issue with Nokia phones if the sender of the text leaves the Write Message screen open after sending the text. With this screen open the phone does not enter touch-tone (DTMF) mode when they answer the IVR call and we therefore reject the customers PIN .
This only happens with Nokia phones.
Any ideas anyone?