TBM3989, being able to multitask while on the phone is a great feature, so I would be happy to ensure that you are able to text and talk at the same time. First, it is important to ensure that HD Voice is enabled on your device. Below are steps on how to enable it on the iPhone: http://spr.ly/6583DNvzP
To ensure that I avoid any assumptions, please shed light on the users you are attempting to use the services simultaneously with. The reason why I ask is that the person you're calling has to be using an HD Voice-capable phone at the time of the call.
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If my response answered your question please click the _Correct Answer_ button under my response. This ensures others can benefit from our conversation. Thanks in advance for your help with this!!