I actually have no problem with data and voice at the same time. Try following the steps I use. First open your browser, then use slide aside to hide it. Now open up the dialer, make a call (dial or use contacts, as normal), while the call is active, slide the browser window back open surf like as always. Slide the browser back closed, and the call is still there. You can even use speaker phone and talk while browsing. This does not work if you try to open phone app before browser, because the phone app does not support slide aside, therefore it has to the second app opened. One thing, after your call remember to close the slide aside window, or it will just stay open in the background. Hope this works for you, just remember, you have to open the browser first, and slide it aside before making call.