Without using a Gateway or some sort of USB to XBee connection that can connect to the IPhone, IPad or other portable device, it is not possible. The reason for that is that the wireless devices you are referring to such as your smart phones, PDA Etc don't offer an 802.15.4 or Zigbee Wireless transceiver in them. Instead it may be better for you to use one of the Connect port X2 Gateways to collect the data and send it up to the Cloud. Then your apps on your phones can collect to the Cloud and poll the data.