Great question and the answer is yes! If you are using a device that allows you to dial a phone number you also have the ability to enter a passcode via the touchscreen, you are able to use the Audio Conferencing service.
We would caution you to enter the passcode digits slowly with your touchscreen. We have found that a touchscreen on a smart phone or tablet can be sensitive and it may not register every digit on the audio conferencing bridge. It will however...if you enter them nice and slowly!